Following Marvel’s major “Avengers: Doomsday” cast reveal on Wednesday, Paul Rudd — who will be returning in the film as Ant-Man — stopped by “The Tonight Show,” but he wouldn’t give up one single spoiler. As he joked with the NBC host, Marvel is far more secretive than the Trump administration is with military plans.

As Rudd took the stage on Thursday, Fallon immediately went for the Marvel questions, asking if there was anything at all about the movie that Rudd could reveal in terms of story.

“There is nothing that I can tell you. They are very secretive,” Rudd said. “It’s really — it’s important. Clearly, as we know, they never announce anything. This is, you know, it’s a major movie. You can’t be frivolous with this kind of stuff. It’s nothing like, you know, military secrets or anything.”

“This is a major motion picture,...