Paul Rudd on keeping 'Avengers: Endgame' secrets from his kids

Ant-Man talks about finally seeing "Avengers: Endgame," his bromance with co-star Jeremy Renner and more, live on "GMA."
6:05 | 04/26/19

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Transcript for Paul Rudd on keeping 'Avengers: Endgame' secrets from his kids
Used the stones again. We've been going in shorthanded. He's still G the stone. So let's get him. Use them to bring everybody back. Just like that? Yeah, just like that. Even if there's a small chance that we can undo this, I mean we owe it to everyone who is not in this room to try. If we do this, how do we know it's going to end any differently than it did before? Because before you didn't have me. There you go. I know you've been waiting for so long. "Avengers: Endgame" came out last night. Already breaking records officially in theaters today. Should we get to it and bring out one of the have right now. His tiny character plays a big role in the new movie. The man of the hour, Antman, Paul rudd. Good morning. Thank you. Do you like to be called tiny all the time. Tiny all the time. I get that a lot. It's true. It's finally out. You got to see it for the first time at the premiere on Monday. Yeah, that's right. Give us your big review. It was -- I thought it was great. I mean, you know, I'm a little biased but, you know, I think taking the most objective stance I could -- I thought it was fantastic. Well, it's out and open now. You guys have to keep secrets for a very long time. Right. Do they now say, okay, you can go talk about it? We could ask what the ending is and officially -- Nobody has said anything to me so until they do I'm just going to keep my mouth shut and I still, you know, I play it really safe and don't even talk about the sixth sense and that's been out for years. So even more important review, your kids. What did they think. They loved it. Yeah. They're really into the MCU and all of the films so we all went to the premiere together and they were blown away. Forget about press tour. You can keep a secret on a press tour. How do you keep the secret at You just -- I think they've learned at this point to just stop asking. My 9-year-old daughter has -- although will still say, you can tell me. I'm not going to tell anybody. And I just say, I don't know. I really don't know. Makes it easier. That's the way to keep it. Yeah, that's probably the safest bet. You play Antman. Have you thought about if you could play any other avenger, which one you would be? I haven't given that too much thought because I'm not so sure they'd cast me as any other avenger. Except maybe Thor just because Hemsworth and I are -- we're just so physically similar. There is that. So I could see -- they wouldn't have to adjust the costume too much. So I guess Thor. We had Jeremy Renner on the other day. He said you made him so laugh he got a six pack -- Well, if that's true, the same apply, that guy cracks me he's the best. He's the best guy. He really -- no joke. I mean, you know, I've known him for awhile and it was really fun to do all the kind of -- all press with him and actually I did some with Scarlett Johansson and Chris Hemsworth and were all incredible and a lot of fun. Jeremy is a good guy and great actor. Do you spend more time together on the tour than actually filming? Probably. Yeah, because we're going to these different places every day, we're kind of sitting in a hotel room behind a plant and a poster and -- 234rs. Why do they do that. By the way, I always wondered until I got into this business, why do so many actors sit in black, dark rooms next to a fern. And, oh, that's how that works. And every five minutes somebody else comes in and, you know -- So you're hosting "Snl" for the fourth time. This is going to be the -- Yeah. In may. Yeah. But you already have your work cut out for you apparently because your co-star, avengers so star Scarlett Johansson says she'll mess with you when you're on so are you ready? Did you hear that and are you ready? Just heard this. Just in. It's already. If it messes me up they'll edit it out and fix it on TV. What are the possibilities if Scarlett Johansson is going to mess with you, what is the first thing that runs through your mind. Well, by the way, it's the most nerve-racking thing in the world. I've done it a couple of times and each time I think why do people put themselves through it? It's terrifying and if Scarlett were to do something, yeah, oh, god. You change things right up to the last minute. Yeah, yeah, they'll change it in between kind of do a run through for dress and change it for the show. That's always I thought that was so funny when bill Hader would do stephon, sometimes he's reading those cue cards for the first time live on TV and he would start laughing because John Mullany would have written something he's never seen specifically to throw him off so maybe if Scarlett does something like that, I'll just go like Hader does. You seem like you all get along and it's a fun group. It is. It's a really fun group. I mean, I'm pretty new to it. But it's been an incredible experience and I'm really lucky to be surrounded by such great actors and such nice people. Well, breaking all kinds of records this weekend. Congratulations for that. Wow. Wow. I have very little to do with that, but thank you. "Avengers: Endgame" in theaters right now and coming

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

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