Yesterday was an eventful day for Sam and Spike. They went gem hunting and had a fight with the Diamonds Dogs. Sam became Zambolar and obtained Bolgils’ D.N.A to add him to his collection. Now Sam had twelve monsters and had became five of them, Agira, Lunaticks, Litra, Red King, Miclas and Zambolar. Now Sam was relaxing with his new family and friends in the park near a lake. They were enjoying themselves when Spike came running up in a hurry.

“Twi… light”, he panted, “I… have… let me just…” Spike took a deep breath and then let out a belch of green fire followed by a letter which Twilight opened it with her magic.

“Pardon you Spike”, Sam said.

“Thanks”, he replied.

“Dear Twilight, I am sure you are as excited as I am about the upcoming wedding in Canterlot”, Twilight read, “wedding?”
“Huh?” everyone said at once.

“I will be presiding over the ceremony but would very much like you and your friends to help with the preparations for this wonderful occasion”, Twilight continued to read, “Fluttershy, I would like you, The Dazzling Sisters and your songbird choir to provide the music”.

“Oh my goodness! What an honour!” She said excitedly.

“Right, it give us to show off our powerful singing voices”, Adagio said, her sisters nodding in response.

“Pinkie Pie, I can think of no one more qualified than you to host the reception.”

“Hip, hip, hooray!” Pinkie shouted.

“Applejack, you will be in charge of the catering for the reception.”

“Well, colour me pleased as punch!” Applejack stated.

Twilight continued to read, “Rainbow Dash…”

Rainbow yawned in response.

“I would very much appreciate it if you could perform a Sonic Rainboom as the bride and groom complete their "I do’s.”

Rainbow was surprise to hear this, Princess Celestia wanted her to preform a Sonic Rainboom. “Yes!” she shouted.

“Rarity, you will be responsible for designing the dresses for the bride and her bridesmaids and best colts.”

“Princess Celestia wants me to make the… wedding dress?” Rarity was in utter shock, “for a Canterlot wedding… I, ah, ooh, oooh!”

“And as for you two, Twilight and Sunset, you will be playing the most important role of all: Making sure that everything goes as planned. See you all very soon. Yours, Princess Celestia”, Twilight finished reading the letter, a little confused to why the letter never said who was getting married. “But... I don't understand. Who's getting married?”

“Oh, wait!” Spike said before bringing another letter, “Uh, I was probably supposed to give you this one first.”

Twilight rolls her eyes as she reads the other letter. “Princess Celestia cordially invites you to the wedding of Princess Mi Amore Cadenza and...” she gasped to see who it was, “My Brother?!”

“What?!” Sam gasped, “You have a brother?!”

“Your brother's getting married?” Applejack said, “Congratulations, Twilight! That's great news!”

“Yeah, great news. That I just got from a wedding invitation! Not from my brother, but from a piece of paper!” Twilight felt insulted, “Thanks a lot, Shining Armor! I mean, really, he couldn't tell me personally!?”

She then started to mock him. “Hey, Twilight, just thought you should know I'm making a really big decision that changes everything. Oh, never mind, you'll hear about it when you get the invitation.”

“And Princess Mi Amore Cadenza? Who in the hoof is that?!” Twilight was annoyed at this.

“Urm, Twilight are you okay?” asked Fluttershy, she was getting worried about her friend.

“Sorry, it's just that Shining Armor and I have always been so close. He's my B.B.B.F.F,” Twilight said, getting a confused look from everyone.

“B.B.B.F.F. What does that mean?” Sonata asked.

“Big Brother Best Friend Forever?” Twilight said.

“Oh,” everyone said at one.

“Before I came here and learned the importance of friendship, Shining Armor was the only pony I ever really accepted as a friend.” Twilight explained before she started to sing.

When I was just a filly, I found it rather silly,
To see how many other ponies I could meet,

I had my books to read, didn't know that I would ever need,
Other ponies to make my life complete,

But there was one colt that I cared for,
I knew he would be there for me,

My big brother, best friend forever!
Like two peas in a pod, we did everything together,

He taught me how to fly a kite (Best friend forever!)
We never had a single fight (We did everything together!)

We shared our hopes, we shared our dreams,
I miss him more than I realized... It seems...

The others started to join in.

Your big brother, best friend forever,
Like two peas in a pod, you did everything together,

You shared your hopes, you shared your dreams,
You miss him more than you realized... It seems...

Twilight continued onward.

And though he's, oh, so far away,
I hoped that he would stay,

My big brother best friend,
Forever... forever.....

“Wow. That song is beautiful.” Sam said as a tear rolled down his face, “You’re big brother getting married. I bet it’s like the happiest moment to happen in your family line, Twilight. You never told about him to me.”

“Yeah. He’s very special. I mean, they don't let just anypony be captain of the Royal Guard”, Twilight said before Rarity almost tackled Twilight to the ground.

“WHAT!? So let me get this straight: We're helping out with the wedding of not only a princess, but a captain of the Royal Guard?” she asked.

“I guess we are,” Twilight said.

Soon everyone was on the train heading to Canterlot to help with the wedding. Though while everyone was busy talking about their plans, Sam noticed that Twilight seemed distracted by something. So he went over to talk to her.

“Twilight are you ok?” he asked with concern in his voice.

“Hm, oh, sorry Sam”, Twilight replied, “I’m just a little upset about that my brother won’t come and tell me in person that he was having a wedding.”

“But you are happy that he’s getting married?”, Sam asked again.

“Of course I’m happy that he’s getting married”, Twilight said getting a little mad as well, “but it’s to somepony I don’t know about.”

"But just be glad you can still your brother. I can't even say 'hi' to my siblings anymore", Sam whispered. But he said that to himself.

Soon the group arrived at Canterlot Station just outside Canterlot Castle. They all noticed that there was a lot of guards around.

“What’s with all the guards?” Rainbow asked as they disembark from the train.

“I'm sure they're just taking the necessary precautions. Royal weddings do bring out the strangest ponies”, Rarity suggested, “now, let's get going! We've got work to do!”

“And you've got a big brother to go congratulate,” Applejack said to Twilight.

“Oh I’m congratulate him,” she said before walking off, “and giving him a piece of my mind.” A pair of guard grew concerned at hearing that.

“I better check she doesn’t do anything reckless”, Sam said as he ran off to find were Twilight was going.

Twilight looked though the castle grounds until she saw a white stallion talking to a few guards. Sam managed to follow Twilight but was tired from running to catch up with her.

“I got one thing to say to you mister”, Twilight called out as she staggered forward towards Shining Armour and the guard. This caused all the guards to point their spears at her, but Twilight wasn’t fazed by them. Sam however did a double take at this, almost activating the Omnitrix.

“Twily!” Shining Armour called out to his little sister, “Ah, I've missed, you, kid. How was the train ride? I...”

“How dare you not tell me in person that you were getting married!” Twilight scolded him, “I'm your sister, for pony's sake!”

“It’s not my fault”, Shining said, then he looked down to see Sam standing by his sister’s side, “Oh hello there, you must be Sam, the Princess’ have told me a lot about you”.

“Nice to meet you too,” Sam replied, “and how much have they told you about me?” He was getting a little concern at to how much information the Princess’ had told him.

“No need to worry kiddo,” Shining told him, “I know about the hold thing with you coming here and the whole Omnitrix thing.”

“Ok,” was all Sam could say to that.

“Well, anyway”, Shining said getting back on track, “Princess Celestia has requested a major increase in security. Didn't you see all the guards at the train station?”

“Yeah, there's a big wedding coming up. Maybe you heard about it?” Twilight replied sharply.

“It has nothing to do with the wedding. A threat has been made against Canterlot. We don't know who's responsible for it, but Princess Celestia asked that I help provide additional protection,” Shining said before walking away, “this, you two need to see.”

They all walked to a bridge and looked up and they saw a light pink force field that came up with a sudden pop of magic.
Shining Armour gasps a bit at this but soon gets his bearings, “the burden of keeping Canterlot safe and secure rests squarely on my shoulders. Staying focused on the task at hand has been my top priority.”

“Okay, okay, I get it. You've got a really important job protecting all of Canterlot with a force field only you can conjure up,” Twilight said finally calming down, “But still... how could you not tell me about something as big as your wedding? Am I not that important to you anymore?”

“Hey. You're my little sister. Of course you're important to me,” Shining said before embracing her, “but... but I'd understand if you didn't want to be my best mare now.”

“Huh!? Wait, you want me to be your best mare?” Twilight said shocked at this news. “I'd be honoured! But I'm still pretty ticked you're marrying somepony I don't even know! When did you even meet this Princess Mi Amore Cadenza?”

“Twily, its Princess Mi Amore Cadenza is Cadence, your old foalsitter.” Shining said.

“Cadence!? As in THE Cadence!? As in the greatest foalsitter in all the history of foalsitters!?!?” Twilight was even more shocked.

“Heh, heh, heh! You tell me. She was your foalsitter.” Shining responded.

“Who’s Cadence?” Sam asked, getting a little confused.

“Ohmygoshohmygosh! Cadence is only the most amazing pony ever! She's beautiful, she's caring and she’s kind...” Twilight said. Sam laughed a bit at Twilight’s antics.

Twilight began to remember the times she spent with Cadence we she was quite young; she even remembers the little dance they would do.

“How many unicorns can just spread love wherever they go? I only know of one! And you're marrying her!”, Twilight said before jumping around her brother and singing, “You're marrying Cadence! You're marrying Cadence!”

Just then, a pink alicorn walked though the doors. It was Cadence.

“I hope I'm not interrupting anything important,” She said.

“Cadence!” Twilight called happily, before doing their little dance, “Sunshine, sunshine, ladybugs awake! Clap your hooves and do a little shake!”

But Cadence did join in and only said, “What are you doing?”

“Cadence! It’s me! Twilight Sparkle!” Twilight said trying to remind Cadence.

“Uh, huh,” Cadence replied uninterested.

“Oh Cadence this is Sam, Sam this is my foalsitter, Cadence”, Twilight said hoping Sam would be happy to finally meet her foalsitter. But Sam’s face was one of horror as if he saw a ghost.

“BUG!!!” he screamed and without hesitation activated his Omnitrix. A bright light engulfed him and was replaced with a robot that had a head which looked like that of a chicken.

“WINDOM,” He shrieked, as his left hand became a flamethrower and his head fin became red, before shouting, “Begone, Insect!” Windom let loose the flames on Cadence be she bloke it with a shield.

“Sparkle can you keep your pet under control,” She told Twilight, Sam felt hurt from that comment, so hurt that he stopped attacking.

“Well now that’s settled, I've gotta get back to my station, but Cadence will be checking in with all of you to see how things are going.” Shining Armour said before trotting towards Cadence, “I think I speak for both of us when I say we couldn't be more excited to have you here. Right, dear?”

“Absolutely,” she said in response.

“Well, we'll let you get to it”, Shining said before he walked off to continue his duties. Cadence walked off to check how the preparations were coming along.

Twilight and Sam/Windom stayed behind; Twilight wanted to speak with him.

“What was that?” Twilight asked, “firing a flamethrower at Cadence”.

“I had a perfectly good reason for attacking her”, Sam replied, “I’m scared of insects”.

“Cadence is no pest”, Twilight shouted.

“Twilight what did Cadence look like to you?” Sam asked deadly serious about this.

“A pink alicorn with purple tipped wings and a cream, purple and magenta mane and tail”, Twilight answered, a little unsure where Sam was going with this.

“That not what I saw,” Sam said with an intense expression, “I saw a black insect like creature, with green/cyan mane and tail, insect wings and hole in her legs and horn.”

“Oh,” Twilight was shocked at this, “How can you see this?”

“It might be because I’m not from this world,” Sam replied, “or maybe my Omnitrix has given me more than just monsters”.
“Well anyway, let’s try to keep an eye on her”, Twilight said as Sam turned back to normal and the two walked off to find Applejack.

Later, Princess Cadence was with Applejack preparing the food as some country music was playing. Twilight, Sunset and Sam court up with her. Twilight and Sam were telling Sunset about what happened, and she believed them, for she remembered the times when she and Twilight were fillies and played together with Cadence.

Applejack was checking if they had everything, “Cake, check. Ice sculpture, check. Best darn bite-size apple fritter you ever tasted...”

Sam ate one to see if they were the best. He swallowed it, then burped given a thumps up. “That’s a check.

Meanwhile Spike was playing with the cake figurines, pretending they were Shining Armour and Cadence.

“I do, do you?” he mocked Shining’s voice, “I do”, he mocked Cadence before making kissing noises.

“Hiya, Princess”, Applejack greeted Cadence as she walked in.

“Please, call me Princess Mi Amore Cadenza”, she demanded without so much as any politeness in her tone.

“Okay then. Howdy Princess Mi Amore Cadenza,” Applejack responded, “You come to check out what's on the menu for your big day?”

“I sure have,” Cadence said in return.

For the next few minutes, Princess Cadence tried a few pies, cakes and other food.

“Mmm! Delicious! I love, love, love them!” She nervous laughed. She clearly didn’t like them, but she hid it and hopefully Applejack could tell.

“Aw, shucks. Why don't you take a few to go?” Applejack blushed while handing Cadence some food, “Ah’ know how you brides can be. So busy, you forget to get a little somethin' in your belly.”

As Princess Cadence walked off, Sam, Sunset and Twilight noticed that something was strange about her. They could tell that she didn’t like Applejack’s cooking and saw her throw the food she was given in the bin.

“Hmm... you’re right something’s not right,” Sunset stated.

Later on in another room, Sam, Sunset and Twilight visited Rarity who was helping to make some dresses for the mares. Rarity was especially busy with Cadence’s wedding dress. Along with them are Twinkleshine, Minuette and Lyra.

“You should’ve seen how she acted back there. I don't know when she changed, but she changed!” Twilight said before speaking in a mocking tone, “Please, call me Princess Mi Amore Cadenza.”

“Did I hear someone say my name?” Cadence asked, walking in.

“Your highness!” Rarity yelled before running to her, “Let me just start by saying what an honour it is to play a role in such a momentous occasion.”

“Uh-huh. Is my dress ready?” she unenthusiastically replied.

“Yes, of course.” Rarity stammered, “Um, I've been working on it ever since I was given the assignment, and I think you'll be pleased with the results! Mmm!”

“I was hoping for something with more beading and a longer train.” Cadence said.

“Oh, yes, of course,” Rarity faltered.

“And those should be a different colour,” Cadence demanded.

Ugh... can you please just stick to that ONE thing you’d want on your dress, please...?! Rarity pleaded.

“I think they're lovely,” Twinkleshine commented.

“Me too,” Minuette said.

“I love them,” Lyra expressed.

“Make them a different colour,” Cadence said before leaving.

“Gee, maybe her name should be ‘Princess Demandy-pants’", Twilight said. In which Sam and Sunset rolled their eyes and nodded in agreement.

Later that night, in Shining Amour’s room, he was getting himself ready until there was a knocking on his door, and he answered it and saw Sam and Twilight standing there.

“Twily! Your big brother's looking pretty good, don't you think? Huh..? Everything okay with you and Sam?” He said not seeing their worried looks on their faces.

“We need to talk. I think you're making a big...” Twilight said before being cut off by Cadence clearing her throat.
“Oh, uh, hi, sweetie”, Shining said.

“She sure has a way of sneaking up on people”, Sam whispered to Twilight.

“Could I speak to you for a moment, dear?” Cadence asked before walking away.

“Better see what she wants,” Shining said. He then closed the door and walked off.

Sam and Twilight pressed their ears against the door and they both could hear Shining Armor and Princess Cadence talking.

“Look, we need to talk,” Cadence said.

“I'm here to talk,” Shining replied.

“It's about your sister, okay?” She told him.

“I... look, look, she's okay...” he said trying to prove his sister is fine.

“Just... listen to me, alright..?” Cadence almost shouted.

“I’m listening, I’m listening...” Shining said.

“I thought I made it perfectly clear I didn't want you to wear that,” She said looking at future husband’s suit.

“This was my favourite uncle's” Shining said, trying to defend his uncle’s honour.

“And..?” Cadence said raising an eyebrow.

“And I think I should wear it,” he alleged.

“Are you disagreeing with me?” Cadence asked disapprovingly.

“I guess I am...” Shining said before suddenly getting a pain in his head.

“Oh, dear. Are you getting another one of your headaches?” Cadence said before using her magic from her horn to heal his headache, “Feeling better?”

From the other side of the door, Sam and Twilight were shocked.

“I can’t believe this!!! And all this time, she’s been rude to our friends, has a rude and unpleasant attitude and now she’s hurting Shining Armor!?” Sam declared, “I knew she wasn’t right!”

“She isn’t just unpleasant and rude... She’s evil!!!” Twilight shouted before running off, grabbing Sam with her magic.

The next morning, in the main hall where the whole wedding is taking place, the Mane Ten along with, Spike and Princess Celestia along with Shining Armor and Princess Cadence was getting ready.

“Perfect, girls. No need to rush. Then of course, Cadence will enter,” Celestia was telling how the thing will work, “I'll say a few words, and then we'll begin with the vows. Shining Armor, you'll get the ring from your best mare.”

“Hey, anypony seen Twilight?” Rainbow Dash called out.

“No..? But where’s Sam?” Sonata asked.

“It’s not like them to be suddenly late for this special occasion...” Fluttershy said.

Suddenly, the doors burst open to reveal Sam (who had became a monster to act stronger and braver), and Twilight Sparkle with angry expressions. The monster in question was a ferocious-looking, reptilian monster with a cranial horn atop its head. Its name was Arstron.

“We’re here! We’re not gonna stand next to her! And neither should you!” Twilight shouted, surprising everyone.

“I'm sorry, I... I don't know why she's acting like this,” Shining apologised.

“Maybe we should just ignore her,” Cadence said sternly.

“No! You listen to us now!” Arstron roared.

“Oh, goodness..! Twilight..? Are you okay..?” Fluttershy asked.

“I’m fine..!” Twilight said.

“Ya sure about that?” Applejack said.

“I've got something to say! She's evil!” Twilight shouted.

The girls and Spike began to mutter amongst themselves.

“She's been horrible to our friends, she's obviously done something to her bridesmaids, and if that wasn't enough, I saw her put a spell on my brother that made his eyes go all..!” Twilight shouted laying out everything Cadence was doing while Sam made his eye go all zombie-like.

“Why are you doing this to me?!” Cadence said while beginning to cry.

“Because you’re EVIL!!!” Sam/Arstron bellowed.

Cadence began to run away while crying her eyes out.

“Evil! And if I don't stop you, you're gonna ruin my brother's life!” Twilight called out to her.

She turned around and bumped into Shining Armor’s leg and she looked up at him to see he had an angry expression on his face.

“You want to know why my eyes went all… Zombie-like?” He said almost growling while getting a little headache in the process, “Nggh! Because ever since I started having to perform my protection spell, I've been getting terrible migraines. Cadence hasn't been casting spells on me. She's been using her magic to heal me!”

Twilight inhaled to speak but was cut off by a very angry Shining Armour.

“And she decided to replace her bridesmaids because she found out the only reason they wanted to be in the wedding was so that they could meet Canterlot royalty!”

Sam/Arstron, Twilight’s friends and Celestia all watched with quiet and shocked expressions as Shining Armour continued ranting.

“And if she hasn't been on her best behaviour with your friends, it's because with me being so busy, she's had to make all the decisions about the wedding!” He finished, before Arstron stood in his away.

“Now wait just a minute, Captain of the Guards!” Sam/Arstron growled, “Twilight Sparkle is trying to help you! You just can’t..!”

“She's been completely stressed out because it's really important to her that our big day be perfect! Something that obviously wasn't important to YOU!!!” Shining shouted making Arstron seemed not as strong and brave.

Sam and Twilight looked at him very shocked after what he just said.

“Now if you’ll excuse me, I have to go and comfort my bride!” Shining said before storming off, “And you can forget about being my best mare! In fact, if I were you, I wouldn't show up to the wedding at all..!”

“Twilight....?” Sam said as the Omnitrix timed out and turning him back to normal.

“C'mon, y'all. Let's go check on the princess...” Applejack said as she walked passed the sadden Twilight and Sam.
One by one, each other Twilight friends left. First Fluttershy, then Pinkie, then Rarity, then Rainbow, then Spike without saying a word. Sunset, Adagio, Aria and Sonata were very confused on what to do. They knew Twilight since fillyhood, and they knew she wasn’t the one who would lied.

“Um... Sam..?” Aria said as she walked up to him, “That was amazing how you stood up to him... but... I’m not mad at you... but we’ll just leave you two alone to have some time... see you later...”

“I’m sorry, you two...” Adagio said as she too walked off.

“Twilight… Sam...? Do you want company…?” Sonata asked, deeply concern about her friends.

“No thanks, Sonata... you go on ahead...” Sam said with a gravelly voice.

“Okay”, Sonata sadly replied, she turned around and walked away.

Celestia was also leaving, Twilight tried to say something, “I was...”

“You have a lot to think about,” Celestia angerly cut her off. She walked out the doors and slammed them shut.

Soon the only ones left were Sunset, Twilight and Sam who were crying their eyes out.

“Twilight…” Sunset softly spoke, “I’m not leaving you; I’m going to try and convince the girls that you two were right.” And with that Sunset teleported out the main hall to find the rest.

“Twilight..?” Sam called out.

“Maybe I was being overprotective. I could've gained a sister. But instead... I just lost a brother...” Her eyes soon started to fill up with tears again. She then started to sing softly.

He was my big brother, best friend... forever...
And now, we’ll never do anything... together.....

They both looked up again and saw Princess Cadence looking at them with a calm expression on her face as she stroke Twilight’s mane.

“I’m sorry,” Twilight said hoping Cadence with forgive her.

But her calm face turned to an evil grin as green fire crackled around Twilight. She looked at Cadence to see her eyes were green. Twilight then felt herself being pulled down by an evil looking magical ball. Before she completely disappeared she heard Cadence say three words which scare her down to her core.

“YOU... WILL... BE....!!!”

After that, total silence. Sam had ran out the room after seeing his adoptive guardian be surrounded by green flames and being pulled down. He looked back in the room to see both Twilight and Cadence gone.

TWILIGHT!!!” he shouted.

Sam had to find Twilight as he started to find a monster that could burrow, and he found one.

“Don’t worry Twilight, I’ll find you.”

TO BE CONTINUED...

Chapter 5 part 1 complete. Next time: Sam and Twilight find the real Cadence and have final show down with the fake.

Bonus Challenge: To anyone who know the Ultraman series, try and guess who the monster that Sam is about to become is.