Marvel previews Doomsday footage and cast news at Comic-Con
- Marvel showed exclusive "Avengers: Doomsday" footage at Comic-Con's Hall H
- Footage showed Doctor Doom's Sentinels facing Avengers, Fantastic Four and X-Men
- Ryan Reynolds and Hayley Atwell confirmed to return, appearing on stage in person
Marvel Studios used its San Diego Comic-Con Hall H panel to unveil exclusive footage from "Avengers: Doomsday" alongside new cast confirmations, giving fans their clearest look yet at how the studio is merging its separate hero franchises into one storyline. The brief, roughly 40-minute presentation left some attendees…