ET attended Entertainment Weekly's and Syfy's Comic-Con party to get the inside details into the 'Iron Man' and 'The Avengers' films, as well as 'G.I. Joe: The Rise of Cobra' and the hit TV series "True Blood."

'Iron Man' director Jon Favreau confirmed to ET that the stars of the film series are under contract for three movies."I think they're trying to keep the same people involved and combine them all for 'The Avengers,'" Favreau says of the actors in 'Iron Man.'

Other action stars to attend the Comic-Con bash included 'G.I. Joe' star Adewale Akinnuoye-Agbaje, "Hercules" actor Kevin Sorbo and Edward James Olmos of 'Battlestar Galactica.'

ET also talked with some of the cast from the vampire series "True Blood." Alexander Skarsgård, who plays vampire sheriff Eric Northman on the show, calls the response to the program at Comic-Con "overwhelming."

New "True Blood" cast members Michelle Forbes (Maryann Forrester) and Michael McMillian (Steve Newlin) also share their experiences at the convention.

Keep checking ETonline for more Comic-Con coverage…