The group and Gumball and Darwin walked back to the Watterson house. "That was terrifying, and awesome," said Gumball, who was both excited and frightened about the fight with General Dienus and the two mechbeasts. "The last time we saw him, he nearly ruined our quest," said Finn, as he proceeded to tell them all what he knew about that Kronosian general. After hearing that, Darwin said, "I don't want to meet him again," in a frightened tone. "Me too," added Fluttershy. "Well, there's a very big chance that Xanazor will send either him or some other of his generals or some mechbeasts at us," said Sonic. The duo gulped.

"Something else that I forgot to tell you," said Lorina. "Not again," groaned Rainbow Dash. "Do you remember that Starrunner general that I said who was corrupted by Xanazor?" Lorina said, "Yeah," said Finn, "General Dienus was that corrupted Starrunner general," she said. "Everyone all gasped about this revelation. "This is getting strange," said Knuckles, "Tell me more about this 'Xanazor' and these 'Starrunners," he said. "We must get to a residence first and then I can tell you," she said. "Speaking of residences, where can we stay if this will last several days?" asked Sonic. "You can always stay in our attic," said Gumball. "Thank you for your hospitality," said Rarity. "Your welcome," said Darwin, and the group all headed back to the Watterson house.

When they got back in, the group all headed up to the attic, and Gumball and Darwin were glad that their mom wasn't at the front door and didn't watch the entire fight for if she did, they might not be allowed to join the group and they wanted to despite some of the danger.

As they were walking upstairs, a pink rabbit came running downstairs. "Gumball, Darwin, and whoever you guys are," she said, looking at them and the group, "You guys were amazing," "Yeah we were," said Gumball, trying to snatch the attention. "I was talking to them," she said, annoyed. "I was wondering, why did you come to Elmore?" she asked the group, "So that's what this place is called," thought Twilight. Finn told her all about their journey, the search for the energy sources, and the Kronosians. Anais's mouth was open in awe after hearing it all. "Wait a minute," she said, "how can I be sure that you're not lying?" Finn and everyone else in the group pulled out A Gem of Light, A Chaos Emerald, and the Mane six pulled out their Elements.

This was enough to convince her that they were right and telling the truth. "Okay, I will join," she said. "I'm not sure about that since you're little and it will be very dangerous," warned Sonic. "I am very smart and even if I can't fight with you, I can help you out in other ways," she said. "Like how?" asked Twilight Sparkle to her.

But right after she said that, an explosion shook the house. "What's happening now?" asked Gumball, who was panicking a little. "Let's find out," said Sonic and he raced out the door at a fast speed. Rainbow Dash followed at a fast speed and soon everyone ran down to see what was the problem.

Once they all got outside, they saw that there was a large monster and it had four heads, one was green, one was white, one was red with some flames on it, and the final one was blue. Lorina scanned it for a moment and after she finished she said, "That mechbeast is called the Elemental Hydra and each of its heads represent a certain element. "Like the Elements of Harmony?" asked Pinkie Pie. "Not that kind," she said. But the mechbeast wasn't willing to wait for them to stop talking and launched its attacks on them.

The red head shot streams of fire, the white head breathed out a tornado to attack them, the green head gave a loud roar which caused earthquakes and the blue head spat out a stream of water. All of the attacks went toward the group and Sonic, Rainbow Dash, Tails, and Shadow and most of the group got away in time, but Finn, Jake, Gumball and Darwin got hit by the attacks.

"Finn," shouted Twilight Sparkle when she saw his body. "Gumball, Darwin!" shouted Anais when she saw theirs. The mechbeast's green head gave a loud roar which caused a crack to head toward the group. Once again, they avoided except for Omega who got caught when the crack imploded. Shadow leapt up and spin-dashed at it but he hit its heads which had no effect on it. It responded by breathing a spout of water from its blue head, which knocked Shadow into the Watterson house.

After that, the mechbeast walked towards them but then it felt something very irritating strike its heads and turned up to see that it was Charmy and Saffron who were using their stingers on it. Annoyed, the mechbeast's red head was about to kill them using fire when a rainbow blur swept the two away and brought them back to the group. After it landed the two bees saw their rescuer was Rainbow Dash. "You might have hurt yourselves," said Fluttershy to the two bees.

The mechbeast continued to attack and its white head spat out a torrent of air at them, propelling them into the sky and then they fell down onto the ground with a thud.

As the mechbeast was preparing to attack again, Julie-Su aimed her blasted and fired at the mechbeast. The blast hit one of the eyes of the red head and it angered it to the point it spat a fireball at her but Knuckles got her out of the way and the fireball hit the mailbox she was standing in front of. "I'm gonna miss that mailbox," said Gumball.

The green head roared again and it caused the ground to cave in a little, creating several holes and Anais fell into a hole but Darwin grabbed her just in time.

"How do we beat that thing?" asked Tails. Lorina appeared on her disk and said, "According to my results, this mechbeast's weakness it somewhere in its belly. "But how do we get it on its belly?" asked Gumball. While they were walking, Darwin noticed some banana peels lying around and a light bulb lit on his head. "I've got an idea," he told the group.

The mechbeast walked closer to them and right before it attacked, it got hit in the head by some trash. It turned its heads to see that Gumball and Darwin were throwing the trash at it and instantly changed its targets to them. It charged at a very fast speed at them but it didn't notice the banana peels and it slipped on them and fell on its back, exposing its belly.

"Now!" said Finn and everyone attacked its vulnerable point and killed it after a while. The mechbeast's remains then disintegrated afterwards.

"Well, that was an easy way to defeat it," remarked Sonic. Gumball and Darwin looked at it for a while and then realized that although they didn't have special abilities, they could help in other ways. "Let's go home," said Anais.

When they were heading upstairs, Knuckles asked Lorina, "So can you tell me more about these 'Starrunners?'" "I will," she replied.