Marvel Studios returned to San Diego Comic-Con with dancing Deadpool variants and a choir for a panel that included news about the next two "Avengers" films and surprise guests, including Harrison Ford and Robert Downey Jr.

Downey is returning to Marvel's films, but not as Iron Man. He'll play the villain Victor Von Doom, or Doctor Doom, in at least one of the upcoming "Avengers" movies. Downey kicked off Marvel's movie successes in "Iron Man" and played the popular character in nine films, but on Saturday appeared wearing Dr. Doom's mask and a green cloak.