Here’s a 30-saecond first look at the sophomore season of ABC’s superhero series. The voice-over reminds the team that “the enemy has the advantage, but we must fight on for those we’ve lost so the sacrifices they made were not made in vain.” There’s lots of running, explosions, anguished glances and the like. Marvel’s Agents Of S.H.I.E.L.D. returns for Season 2 on September 23, moving to the 9PM slot.