Cara Delevingne and Justin Timberlake speak at San Diego Comic-Con

Hordes of zombies, legions of Stormtroopers, leagues of superheroes and crews of Starfleet marched into San Diego today for the opening day of the legendary San Diego Comic-Con. The pop-culture celebration kicked off last night with the festival’s preview night, where con-goers with four-day passes have first crack at the collectables, free swag and photo…