New Delhi, April 17 -- The Walt Disney Co. staged a blockbuster-sized presentation for theater owners Thursday at CinemaCon, showing the opening to the new Star Wars film and new footage from "Avengers: Doomsday," featuring the return of Chris Evans as Captain America.

Robert Downey Jr. was there to introduce the trailer for the film, which brings together the Avengers and the X-Men together in a Marvel Studios film for the first time.

"What I want to do is give away like 30,000 spoilers right now," Downey said.

He's returning to the franchise not as Iron Man, but as the main antagonist Victor Von Doom, or Doctor Doom.

Kevin Feige said they'll be re-releasing "Avengers: Endgame" in September in the lead up to "Doomsday," which, he sai...