VIDEO: Sneak Peek - Winter Finale of ABC's MARVEL'S AGENTS OF S.H.I.E.L.D

On the Winter Finale of ABC's Marvel's Agents of S.H.I.E.L.D. titled "What They Become", Coulson and Whitehall's forces meet in an explosive confrontation that dramatically alters everyone's fates. Meanwhile, Skye discovers shocking secrets about her past.

The episode airs Tuesday, December 9th on ABC. Get a sneak peek below!

"Marvel's Agents of S.H.I.E.L.D." stars Clark Gregg as Director Phil Coulson, Ming-Na Wen as Agent Melinda May, Brett Dalton as Grant Ward, Chloe Bennet as Agent Skye, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons and Nick Blood as Lance Hunter.

Guest starring are B.J. Britt as Agent Antoine Triplett, Adrianne Palicki as Bobbi Morse, Henry Simmons as Alphonso "Mack" Mackenzie, Ruth Negga as Raina, Patton Oswalt as Billy & Sam Koenig, Reed Diamond as Daniel Whitehall, Kyle MacLachlan as The Doctor, Jamie Harris as man and Hunter Seagroves as Hydra agent.

"What They Become" was written by Jeffrey Bell and directed by Michael Zinberg.

"Marvel's Agents of S.H.I.E.L.D."  is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. A TV parental guideline will be assigned closer to the airdate.

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For more information on "Marvel's Agents of S.H.I.E.L.D.," visit ABC.com