Everyone instantly started raising their hand wanting to be Class Rep but Iida stopped them and had everyone vote most of them were hesitant but Izuku and Yaoyorozu were the winners with Bakugo having one vote.

Bakugo - Damn it.

Goku - Okay then. Make sure you guys do your assignments and be ready for the next class after lunch and we are leaving to a trip to a facility with All Might, and another pro. So be ready.

Class - yes sir

During lunch the school security breach alarms went off and Goku felt 2 energies in the file room he used his instant transmission but when he arrived he saw a mist of purple but it vanished as he arrived.

Goku - Weird.

(Timeskip)

Izuku and Yaoyorozu got everyone to get in costume as they went on the bus and Goku took a small nap with Bakugo and Izuku smiling at each other as they started playing with him. Mina and the others took pictures or video some just didn't care but some of the girls found it cute how Goku was such a care free teacher but he looked so young for being a father.

Izuku - Dad wake up were here!

Goku got up as everyone was introduced with 13 the Space Hero. As they went inside getting ready for a training session but Goku, Izuku and Bakugo got on guard as they felt many energies

Kirishima - What's going on?

Goku - Get back don't move until I say so.

A giant mist opened and out came out hundreds maybe a thousand. But Goku was more focused on the 3 big ones on the back.

Goku - 13 get everyone else back outside. Kaminari the moment you get outside contact the school and the police.

13 and the others were leaving as Goku stared down at the villains.

Kurogiri - It seems only Goku is here. The schedule said All Might was supposed to be here yet he's not.

Shigaraki - Where is he? I've brought so many friends and he doesn't wanna show up? What a bummer.

Goku - I'll give you a chance to leave or I will have to take you out!

Shigaraki - Strange...out of all the hero society I actually am a fan of you Goku. Why is that? I don't hate you and I hate almost everything?

Goku - Well I'm gonna be nice and give you all a chance to leave, and never do bad things again.

Shigaraki didn't say anything as the villains started walking towards the stairs and Goku gave a sigh of disappointment. He powered up slightly to intimidate his enemies but both Izuku and Bakugo got in front of him.

Goku - Boys move.

Izuku - Sorry dad but it's better if we take them on ourselves and you protect the others in case one has a teleportation quirk. You can easily break the door down.

Bakugo - Plus their all just weak thugs. We can take them on.

Goku smiled as he lowered his power and let them go making both smirk. Izuku and Bakugo jumped from the top of the stairs straight down as they got in their fighting pose.

Izuku - Well Kacchan you take the 500 on the right and I'll take the 500 on the left.

Bakugo - Screw you I'll take 500 and 1!

Izuku - That's the spirit. HAA!!!

Bakugo - HAA!!!

Both powered up and started taking out the villains left in right as Goku decided to create a clone of himself using the multi form technique. He jumped and went straight towards the big bird villain as he punched and pushed him away.

Shigaraki - Nomu!

Goku was punching the Nomu repeatedly as it didn't fight back like it didn't have a choice to fight back or defend.

Goku - Strange but it's better this way.

Goku grabbed it from his head and slammed him to the ground as it laid there. As Goku looked towards Shigaraki but the moment he turned around Shigaraki said Nomu. Making Goku turn around and dodged a grab from Nomu. 

Goku - So he was just faking it?

Goku went towards him and punched the Nomu this time but it didn't move.

Goku - What?

Nomu charged at him and tried to attack him but Goku dodged his punches and threw him to the back making it crash on a few trees with Goku shooting two energy blast.

Shigaraki - Nomu.

The Nomu got back up quick and grabbed on the blast but it was never destroyed but it was absorbed.

Goku - He absorbed it? So even in this world there are androids. Great what next a bio engineered perfect warrior.

Nomu rushed at Goku again but his power and speed were increased as Goku dodge an attack but he saw that the impact was higher and he was much faster than before. The Nomu jumped and started a fast assault making Goku block all of his punches as he noticed he was much stronger.

Goku - Damn it if he gets even more stronger than I won't be able to protect the students while fighting this thing. He's gonna probably overpower me if this keeps up.

Suddenly the Nomu was kicked away by two people as Goku saw it was Bakugo and Izuku with both having a huge aura.

Bakugo - You look like you need help.

Goku - Nah but thanks for assuming.

Izuku - How about we finish this with a big ending.

Goku - Ready?!

They nodded as they powered up and everyone for the first time ever Goku has gone Super Saiyan in public as all three of them let out a scream which pushed everyone away and even broke down the door of the U.S.J entrance.

Goku - Ka....

Izuku - Me....

Bakugo - Ha....

Trio - Me.....

Nomu ran towards them as it got much faster and saw the energy as it stopped ready to absorb.

They didn't fire as Goku looked at the Nomu, and out of nowhere the Nomu was kicked to the sky as it showed Goku's clone and went back to Goku.

Trio - HAA!!!!!

The blast pushed the Nomu to the ceiling as it started to break through but the Nomu wasn't done fighting back as he tried to absorb the blast however Goku noticed this and had to finish it.

Goku - Izuku concentrate! Look past your fear Katsuki you can do it! We can end this now but we must work together.

The Nomu was pushing the blast back as he started absorbing everything getting stronger every second.

Goku - Do you want everyone to die?! Then let's finish this......TOGETHER!

Trio - HAAA!!!!!!!

Goku for that moment pushed to his Super Saiyan 2 form and a giant red aura covered Izuku and Bakugo as they pushed the blast even further making a giant explosion as the blast kept being pushed forward as Nomu was sent far to the sky.

Kirishima - Awesome.

Mineta - They're so cool!

The class was happy they won as Izuku and Bakugo fell to one knee slightly breathing hard as Goku just powered down. He turned towards Shigaraki as he saw that Kurogiri wrapped him away.

Shigaraki - Well meet again Goku.

He was gone as Goku helped the boys get up and they called the school telling them to bring the police as Goku grabbed every villain and wrapped them up in a huge disk of energy.

Uraraka - Hey Deku what was that red aura you and Bakugo had?

Izuku - Oh that was a technique we learned from Dad. It's called Kaioken.

Bakugo - It multiplies ones power by the amount you want but it comes at a cost. The higher the multiplier the bigger the strain your body will have. We both can go up to times 5.

Iida - You both are incredibly strong.

Bakugo - In reality Goku could have finished the monster easily but we noticed he was getting stronger by absorbing his power. Goku could have went full power but I feel it could have destroyed the U.S.J so we focused all of our power onto one pure blast and ended the fight.

Goku just kept thinking who could have been able to create something as dangerous as Nomu and that he was glad that he was there if it was only All Might. He would have lost time and clearly die.

Goku - All right everyone back on the bus and we'll call it a day.

Todoroki - Excuse Mr. Goku?

Goku - Yeah Todoroki?

Todoroki - Could I privately talk to you tomorrow alone?

Goku - uh yeah sure. I'll talk to you at lunch tomorrow okay.

Todoroki nodded as Goku saw him leave and could sense a spark of anger and regret inside.

Goku only let out a breath of relief they were able to get out of that without any major trauma or problems.