This is how Stewie and Brian become Superheroes goes in Super Thomas and His Hero Friends.
[Meanwhile in the Family Guy World]
Stewie Griffin: Hey, Brain. What you got.
Brian Griffin: I think I got a text on my phone from another Prime. Ryan F-Freeman?
Stewie: Wow. Let me have a look.
[He look at the Text]
Stewie: So. Meg has a boyfriend? No wonder I watch Crash, Thomas and Ryan Meet the Swan Princess.
Brian: Yes. I think the Prime-prince of Friendship needs our help.
Stewie: We can be heroes to help those heroes.
Brian: How? How can we be a Superhero?
Stewie: Follow me.
[They went to Stewie's Room]
Stewie: I got these in here.
[He open the Closet and see some Batman and Robin gadgets and Costumes]
Brian: How did you get that?
Stewie: I brought it on the Internet.
Brian: Ok. Let's suit up.
They dress up as Batman and Robin
Brian: How do I look, Stewie?
Stewie: You look like George Clooney Batman.
Brian: Oh no! That's the Best looking guy, but the worst Batman!
Stewie: How do you like my villains costume, Brian!?
Brian: That's not a Villain Costume's. That's Robin, he's a good guy.
Stewie: If he's such a good guy, why does he live with Batman rent free? He's a squatter and squatters are public tyrants!
Brian: Maybe Ryan might be hypnotized by the Dazzlings.
Stewie: Look, we don't have time for that, Come on.
Brian: Ok. Let's go see Ryan.
They going down stair
Meg: Nice Batman Costumes, Brian. You look adorable.
Brian: Thanks, but I'm not trying to be adorable. I'm a vigilante.
Meg: Really? People think I'm a vigilante, because I look good in flannel and want a Subaru.
Brian: I don't think you know what vigilante means.
He and Stewie went Outside
Bonnie: Aren't you just the cutest?!
Brian: I'm not cute, I'm a superhero!
Bonnie: No. No way. If I was getting robbed and you came to save me, I'd hand the robber my purse, then steal your wallet so I came out even.
Joe: Cute outfit, Brian
Brian: It's not supposed to be cute! Do people call you cute in your cop uniform?!
Joe: Yes, they do. They see a cop in a wheelchair and think it's a grown up "Make-A Wish" type deal.
Peter saw Brian and Stewie dress up saw Batman and robin
Peter: Hey, guys.
Brian: Peter. Stewie and I are going to help out a Prime-prince.
Peter: The boyfriend of my daughter? Nice Halloween costume.
Brian: It's not a Halloween Costume.
The two of them went off and Quagmire saw them
Quagmire: Don't you have to be rich to be like Batman?
Brian: I may not be wealthy, but I'm rich with character.
Quagmire: Didn't you get caught wearing a fake seeing-eye-dog vest to get into movies for free?
Brian: Just let me play superhero okay!?
Quagmire: I got something for ya.
He punched his Eye
Brian: Ow! What the Heck?
Quagmire: I want to wish you luck.
Brian: Man, that hurt my eye.
Stewie: Let's just get in the car.
He and Brian went into Brian's Car
Brian: You know, I think I'm gonna get Quagmire for giving me Black Eye.
Stewie: Ok. Ryan and the gang, here we come!
[They drive off]