In Eggman's hideout, Dr. Eggman, alongside with his robot minions, Orbot and Cubot, were currently thinking for a plan to destroy Sonic and taking over the world.
Cubot: How about capturing all the animals and-
Eggman: No no no. We already tried that, but were defeated by Sonic.
Cubot: Oh yeah. I forgot.
Orbot: Okay, how about split the world into-
Eggman: You moron! We tried that too! I can't take it anymore. Get out of my face.
Orbot: But... sir, we-
Eggman: I SAID GO AWAY!
The two robot left quickly from him.
Eggman: (thinking) Hmm, if only I can build my Eggman Empire in this world, without getting foiled by that pesky blue hedgehog...
?: You need help?
Eggman: Huh?
A magenta-colored cat and a butler came out of the door.
Eggman: Who are you? And how did you pass my security bots?
Cat: I had my friends to disract them. That makes this visit easier.
Eggman: You!
Eggman is trying to push a button, when the cat interupt it.
Cat: Woah. Take it easy. We're not here for trouble. We simply want to negotiate with you.
Eggman: Negotiate, huh?
Butler: We are similar, sir. We have the same goals...
Cat: ...but always getting stopped by annoying pests. So I want to make a deal. We can work together to make your plan for world domination a lot easier.
Eggman: Sounds very interesting. We have a deal!
Cat: Purr-fect!
Eggman: Also, do you know about the powerful gems, called the "Chaos Emeralds"?
The Cat and the butler looked curious about it.
Somewhere in South Island...
Sonic is relaxing on a tree, when he noticed Tails, who is flying to him.
Sonic: Hey Tails, what's up?
Tails: Sonic, Eggman returned and he's something not good again! I just saw his robots towarding to us.
Sonic: Looks like, he never gives up, huh? C'mon Tails! Time to crash the party!
Sonic and Tails are inmediately on the way to Eggman's army.
The scene switches to Eggman and his army.
Eggman: Hohohohohohoho! Soon, my plan WILL work!
Sonic: Think again, Egghead!
Eggman: Well, if it isn't Sonic!
Sonic: What is your plan this time?
Eggman: The usual thing, but this time, I will succeed! Hohohoho!
Sonic: Not in your dreams! Let's go, Tails!
Tails: Okay!
Eggman: Robots, ATTACK!
The robots coming into Sonic and Tails. But the two destroyed them quickly. Eggman sends out more robots, but Sonic destroyed them already.
Sonic: Give up, Eggman! Your plan will never work!
Eggman: Hmmm. You think so?
A giant robot attacked Sonic from behind.
Sonic: Whoa!
Tails: Sonic!
Tails rushed to his friend for help.
Sonic: I'm fine, buddy. (looked to the robot) Take this!
Sonic tries to attack him multiple times, but the giant robot blocked all of his attacks and knocked him over. It even tried to hit Tails, but Sonic pushed him to safety and took the hit instead.
Tails: No!
Eggman: Hohohohohoho! This is perfect! You have no chance against my Egg Colosseus! Now, face your doom! FINISH THEM!
The Egg Colosseus prepares his powerful attack to Sonic. Tails covered him as a shield. But before he starts, an capsule hits it.
Eggman: What?!
Sonic: Tails, this is our chance!
Tails: Okay! Here we go!
Sonic attacked the robot from the front, while Tails plugged his device to the back of it.
Tails: Okay, Sonic. When I say "Now!", we have to jump away!
Sonic: Got it!
Tails logged inside the robot's data, powered it down and activated the self-destruct mode.
Computer: Self destruct in T-20 seconds.
Tails: Now!
Sonic and Tails jumped away from the robot.
Eggman: What are you waiting for? Destroy them!
The robot tried to attack the duo, but it missed.
Eggman: What did you do to him?!
Tails: I programmed your robot's data to make it weaker.
Computer: Self destruct in 15 seconds.
Sonic: Come on, Tails! Let's kick some Eggman!
Sonic and Tails attacked Eggman together as a team.
Computer: Self destruct in 5...4...3...2...1...0.
When the countdown reaches zero, Sonic delivered the final blow. He kicked Eggman away. Then the Egg Colosseus exploded. Eggman, who is defeated by Sonic, was angry.
Eggman: This isn't the end! Soon your world will collide into a different one and I will conquer them! You'll pay for this!
Eggman escaped.
Sonic: Yeah! We did it, Tails! (looked around) Tails?
Tails looked to the capsule. Sonic came to him.
Sonic: What's wrong?
Tails: I don't know, Sonic. This capsule looks odd.
Suddenly the capsule opened and in the smoke, two shadows jumped out and landed on the ground.
Sonic: Tails, what's going on?
As the smoke faded away, the shadows were revealed as a young human boy with fiery hair and a dog.
Tails: Who are they?
Suddenly, Sonic collapsed.
Tails: Sonic!
He rushed to his friend. Sonic was injured by the robot's attacks.
Tails: Oh no. (Looked to the unknown duo) I wonder, where they come from... (thinks) Hopefully they will help me to save Sonic...
Narrator: After a climatic battle against Eggman, Sonic fainted from his injuries and Tails is now wondering about the boy and the dog. But who are they? Where did the duo come from? And most importantly: What is Eggman really up to? Find out next time in a new episode of Sonic & Johnny Test: Dimentional Chaos!