The season 3 premiere of Heroes will be, rather appropriately, super-sized. NBC will air a three-hour ''event'' on Sept. 15, consisting of a one-hour recap of the previous two seasons, followed by the two-hour season premiere. The third season may also be epic another way: there are rumors that there may be as many as 35 episodes on the schedule. It's likely that at least some of these eps were casualties of the writers' strike, which devastated the current season of the Peacock's sci-fi show: 24 episodes were ordered, but only 11 made it to air.