At Eggman Lair.

It been a few days since the Deadly Six, Katella, and Agent Stone join Y/N empire.

However in the monitoring room Y/N see a few busses arriving at USJ which he smirk.

Y/N: "It time to start my introduction to the world" he said.

At USJ.

The students of Union are amazed at how massive USJ are.

Izuku: "Woah this sure is amazing" he said.

Issei: "I can't wait to see the ladies!" He said with a prevert face only to get puch in the head by Keneko.

Ruby: "I wonder what kind of weapons this place offer!" She said excited.

Naruto: "I hope there strong opponents to fight" he said pump for a fight.

Aizawa: "Alright students. Today" he try to said but a explosion caught everyone attention which they look up to see thousands of robots.

Mina: "Woah they got robots?" She said only for the students to see that both Aizawa and 13 are in attack stances.

Aizawa: "This is not practice!" He said trying to attack but a robot block the attack.

???: "Ohohohohohoho so the famous night hero eraserhead think he is able to fight my creations!" A male voice spoke causing everyone to look only to widen their eyes as a giant robot.

13: "Who are you!" She said which the giant robot chuckle.

Eggman: "I am Eggman! And I bring Union downfall" he said then out of nowhere multiple cubes appear that separate the students throughout USJ.

Above the USJ is a giant airship.

Which is piloting by Sage while Infinite is watching the fight between the students and robots.

Infinite: "I'll admit these robots are handling the students like ease" he said.

Sage: "Well considering the fact father have study his enemies weaknesses ahead is useful" she said which Infinite nod only for an alarm to catch their attention.

Infinite: "Is it Union?" He ask which Sage shake her head.

Sage: "No. But the detectors are picking up powerful energy heading towards us" she said then the two look at a monitor to see a blue energy ball heading towards USJ.

Inside USJ.

Currently Y/N aka Eggman is laughing as he easily beaten Aizawa and 13.

Eggman: "Ohohohohohoho. Is that all Union have to offer!" He said only to get hit by some blue energy surprising him which he look only to be godsmack at what he's seeing.

Sonica: "Hey Egg head I'm Sonica the hedgehog! And I'm here to stop your nefarious plans" she said.

Eggman: "I'm Doctor Eggman! Not Egg head!" He said then try to attack only for Sonica to easily dodge.

Sonica: "Sorry doc but I'm a slippery hedgehog~" she said then begin to spin and attack him surprising everyone as his robot armor started to get destroyed.

Eggman: "Impossible! How can my armor be destroyed by a hedgehog!" He said completely godsmack.

Sonica: "Probably because you never encountered me before~ Now it time for you to go to jail" she said only for a cube to stop her.

Then out of nowhere Infinite appear and create a barrier around Eggman thus hiding his identity.

Eggman: "This isn't over!" He said exiting USJ with his robot army.

A few minutes later.

At Eggman Lair.

Upon entering his Lair Y/N slam his fist onto a table with rage in his eyes.

Meanwhile outside the door is Chris, Agent Stone, Deadly Six, Katella, Infinite, Sage, Cubot and Orbot.

Chris: "... Well guess boss now have a swore enemy" he said which everyone agree.

Y/N: "Curse that hedgehog!" He said yelling with rage.