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‘Marvel’s Agents of SHIELD’ Are on the ‘Highway to Hell’ in New Promo (Video)

ABC series promises plenty of action and excitement as the team goes underground in Season 2

Agent Coulson and his team are heading underground for the explosive second season of ABC’s “Marvel’s Agents of S.H.I.E.L.D.” Clark Gregg leads his rag-tag team as they continue to fight the good fight, even as S.H.I.E.L.D. has been decimated by Hydra, as seen in “Captain America: The Winter Soldier” and the back half of “Agents of S.H.I.E.L.D.’s” first season.

“What once was S.H.I.E.L.D. no longer exists,” the narration says in the latest trailer for the Marvel series, “But their enemies are still out there and the world can’t save itself.”

See photos: Marvel’s ‘Agents of SHIELD’ Unleashes First Look at Season 2 (Photos)

Gregg’s Agent Coulson takes the reins of what is left of the covert organization as AC/DC’s “Highway to Hell” plays on, promising bigger stakes and a higher excitement level than the sometimes sleepy first season offered.

After a fantastic start, “Agents of S.H.I.E.L.D.” slipped in the ratings as the storylines got a little too formulaic and repetitive. But once it connected to the larger Marvel Cinematic Universe about midway through the season, introducing a threat from within S.H.I.E.L.D and betrayal from within Coulson’s team, the show got a lot better.

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More intense and dramatic as it closed the season, ABC and Marvel are surely hoping that “Marvel’s Agents of S.H.I.E.L.D.” can bounce back and become the monster hit they probably wished it would have been out of the gate last season. Maybe they should figure out how to have Rocket Raccoon and Groot from “Guardians of the Galaxy” make an appearance.

Season 2 of “Marvel’s Agents of S.H.I.E.L.D.” kicks off on Tuesday, Sept. 23 at 9 p.m. ET on ABC.