Members of the Avengers may not be hitting the small screen, but the peacekeeping and espionage agency that stands behind them, SHIELD, will be coming to ABC with its own set of heroes. The first trailer for Marvel's Agents of SHIELD aired last night, after being teased on Vine earlier in the day, and the all-too-quick 30-second spot paints the show as a mixture of spy thriller and superpower-studded action. ABC is yet to reveal a release date for the series, but as the network only recently announced that it had ordered a full season based off of the Joss Whedon-directed pilot, development of the show may only just be getting underway.