Comic book fans returned to San Diego, California, on Thursday for the latest Comic-Con, with convention-goers buzzing about this year's return of Marvel. The studio skipped last year's event, but will be back at the coveted Hall H on Saturday to promote "Avengers: Doomsday," which is slated to premiere in December. Calling all vampiresFans began lining up around noon on Wednesday for Thursday's events in coveted Hall H, with sisters Adelaide and Delaney Hall heading up the queue. The San Diego native is eager to see the panel for "Percy Jackson and the Olympians," a fantasy TV series with its third season due out November 20. On Friday, DC Studios will also grace Hall H to preview its HBO series "Lanterns," starring Kyle Chandler and Aaron Pierre as small-town Nebraska detectives, which debuts August 16.