'Thor' actor Mark Ruffalo says Halloween is his kids' 'happiest holiday'

The actor appeared live on "GMA" to celebrate Halloween and discuss his new film, "Thor: Ragnarok."
5:05 | 10/31/17

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Transcript for 'Thor' actor Mark Ruffalo says Halloween is his kids' 'happiest holiday'
I do wonder what the hulk would think about that. Hmm. What would the hulk think about that? That is a good question. Oh! Arrrrgh! Arrrrgh! Mark Ruffalo. Like I say -- Thank you. Hey there. You know what, it's great to have another avenger here. We needed you. We needed you, man? We need you. Chris gave he some great pointers. I thought you were Chris. Oh, you did? We get mistaken quite a bit. In that's really good. It's the hair. It's the hair but you play the hulk in the new movie. That's right. In you in the Thor movie and have a bromance. Everybody said this could be the best one yet. Is that because of the bromance? Probably. Helps out. Well, the fact that I wasn't in any other Thor movies and this is the best one yet -- It's you. It's you. I'm the only thing new. You're the new weapon, all right. In fact, let's take a look at a little clip from the brand-new Thor movie. Take a watch. I'm putting together the team, the hulk is the fire. Wait, you're just using me to get to the hulk. That's gross. You don't care about me. You've not my friend. No, I don't even like the hulk. He's all like I smash -- I prefer you. Thanks. But if I'm being honest when it comes to beings he is powerful and useful. Banner is powerful and useful too. The hulk is powerful. The hulk is hilarious in this movie. Do you have any hulk jokes for us? Put you on the spot right there. Yeah, I don't know. I mean was the hulk ever funny before? You brought the funny to the hulk. He was always angry. We never got to see him any other way and thought it would be nice to see him do something else. What would he be like if he was a roommate? Oh, boy. And, yeah, we wanted to -- we wanted to just completely break all the rules. There's a comedic outlet for all of that anger in yes, he's still angry but he's fun angry. He's fangry. Halloween is big around here at "Gma." Is it? Is Halloween big in the rough low household? Halloween, my kids say it's their happiest holiday. Really? Yeah. I love that. What are your girls dressing up as or your children dressing up as? They're here today. One is a little army sergeant. Air force. And Bella is a rainbow warrior. That's awesome. And I hear they were in the movie. Yeah, they're in the movie. It's a family affair. He got cut out. Oh. Cutting room floor, huh. Welcome to Hollywood, kids. That's how it happens. It's happened to me a lot too. Tough lesson to learn. That's two minutes. Yes, sir. We'll keep going. Give me -- I want a fist pump the hulk. There we go. We have to ask what avengers infinity war all the superheres on the set together is pretty cool, right? Yeah. Yeah. Every character from every marvel movie ever made. Wow. Was there anyone that got you most excited when you saw all of those superheroes altogether. Michelle Pfeiffer, Michael Douglas if they were in the movie I would love to see them. You know what, wonder woman -- I'm breaking code here. Come over, wonder woman. Wonder woman. I want to hear the voice. I want to hear the hulk. I want to hear the hulk voice. Oh. Wonder woman, like, smoothy. Hulk like fire. Sorry. Wonder woman like iron. Hulk like fire. Oh. Oh. Okay. That's good. That's good. Look, we're bridging the gap between DC and marvel. Come here. Oh. If we can bridge the gap. That's right. If marvel and DC can get together we can solve all the problems in the world. Whoo! And you got it right, though but you messed it up. Thor likes smoothy. Yeah, I like a good smoothie. But you know, this movie is incredible. And I'm glad you brought your kids too. Thank you. Happy Halloween. Happy Halloween. These are my friends here too. Look, we got to get -- get everybody right here. That's adorable. Arrrgh! That's what I'm talking about, the movie is "Thor: Ragnarok" and slides into theaters November 3rd. Come see it.

This transcript has been automatically generated and may not be 100% accurate.

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