The Doctor and Derpy ran from the T.A.R.D.I.S and entered The Crystal Empire from the south gate. The Doctor followed the signal on his sonic screwdriver.

"Ok, so that's the castle up ahead?" The Doctor asked.

"Yep!" said Derpy.

"The one with the royal gaud's?" The Doctor asked.

"Yep, how are we going to get in through that gate? It's locked. Also, how are we going to get past those gaud's?" asked Derpy.

"I've got my sonic screwdriver to open the gate and I have physic paper to get past the royal gaud's. See, problem solved before we even got there." explained The Doctor.

"Not if something goes wrong, like it always does." giggled Derpy.

"Oi, not all of the time!" The Doctor said.

"Ok I take it back, not all of the time but most time's." Derpy said.

"Ok, most time's, but it's still not my fault." The Doctor said.

Derpy fell on the floor laughing.

"That's a bit of an over reaction, don't you think." The Doctor smiled.

"No! Not at all. I just think it's funny sometimes when you fail!" Derpy Laughed.

"Yeah, but we're getting distracted, let's just get to the gate as fast as we can. The closer we get, the closer we get to solving this mystery." explained The Doctor.

"Ok, sorry." Derpy said.

The Doctor and Derpy started walking up the path towards the castle. On the way there they passed a few shop's. Derpy got distracted once again by a snow globe.

"Oh my goodness! A Crystal Empire snow globe, Doctor can we get one, please, please, pretty please?" asked Derpy.

"Can't you get one on the way back? We're busy!" explained The Doctor.

"Awwwwwwwwwwwwwwwww!" moaned Derpy.

"Derpy, I promise you, I will buy you one when we get back." The Doctor said.

"Ok, thanks Doctor." Derpy said.

The Doctor and Derpy walked up to the gate.

"It's locked!" worried Derpy.

"Don't worry, as I told you, The sonic will fix everything." The Doctor said.

The Doctor pointed his sonic screwdriver towards the gate lock and activated the sonic screwdriver. The lock unlocked.

"That's breaking and entering!" Derpy said.

"What did I break? Sonicing and entering, much better." The Doctor said with a cheesy smile.

Derpy and The Doctor walked though the gate and approached the castle door's were the royal gaud's stood.

"Halt! Who are you?" asked the royal gaud.

"I'm The Doctor and this is my assistant, Miss Derpy Hooves. We've been hired to fix the lighting in the main hall." The Doctor lied.

"Got any proof of that?" asked the gaud.

"Yes, we sure do." The Doctor said.

The Doctor handed the gaud the physic paper.

"Look's good to me. Let them pass." said the gaud.

The royal gaud handed the physic paper back to The Doctor and the other gaud opened the castle door's for The Doctor and Derpy. The Doctor and Derpy walked in. The Doctor pulled out his sonic screwdriver again and started to follow the energy signal again. They reached the main hall.

"Ok Doctor, the main hall, let's get started on those light's." Derpy said.

"No, Derpy stop, we're not really fixing the lighting, that was just a clever lie to get us in." explained The Doctor.

"Oh yeah, sorry, I forgot." Derpy said.

"Come on, the signal is coming from over there." The Doctor said.

Derpy followed The Doctor out of the main hall and into the corridor. Derpy noticed a black cloak on the floor.

"Hey Doctor, what's this?" Derpy asked.

"I don't know." The Doctor said.

The doctor picked up the cloak and scanned it with his sonic screwdriver.

"Whatever it is, the energy source was with it. Just leave it. The energy source is coming from over here." explained The Doctor.

The Doctor and Derpy reached a room at the end of the corridor. Some ponies were inside talking. The Doctor and Derpy hid round the corner right outside the room where the energy source was coming from.