Robert Downey Jr stunned fans as the Iron Man star removed a mask during the San Diego Comic-Con Hall H panel to reveal that he will play Doctor Doom, one of Marvel’s biggest villains, in the upcoming film Avengers: Doomsday.

The panel on Saturday was flooded with hooded figures wearing masks of the comic book villain known for his sorcery and science when Downey Jr revealed his face. “I like playing complicated characters,” he said as fans began to chant his name.