Marvel's Agents of S.H.I.E.L.D. Season 2 Spoilers: Two-Part Season Finale 'S.O.S.' Official Description Released

The official description for the Season 2 finale of Marvel's Agents of S.H.I.E.L.D., entitled "S.O.S.," has been released, and it reveals a host of guest stars in the tense two-part episode.

Check out the full description below:

"'S.O.S.,' Part One and Part Two - S.H.I.E.L.D. puts everything on the line to survive a war that blurs the line between friend and foe. Coulson and his team will be forced to make shocking sacrifices that will leave their relationships and their world changed forever, on the two-hour season finale of Marvel's Agents of S.H.I.E.L.D, Tuesday, May 12 (9:00-11:00 PM, ET) on the ABC Television Network.

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, Nick Blood as Lance Hunter and Adrianne Palicki as Bobbi Morse.

Guest starring on 'S.O.S.,' Part One are Henry Simmons as Alphonso 'Mack' Mackenzie, Ruth Negga as Raina, Kyle Maclachlan as Cal, Jamie Harris as Gordon, Christine Adams as Agent Weaver, Mark Allan Stewart as Agent Oliver, Maya Stojan as Kara/Agent 33, Dichen Lachman as Jiaying, Luke Mitchell as Lincoln Campbell, Kyle Mattocks as Agent Harris, Ryan Powers as S.H.I.E.L.D. tech agent and Alicia Vela-Bailey as Alisha.

Guest starring on 'S.O.S.,' Part Two are Henry Simmons as Alphonso 'Mack' Mackenzie, Kyle Maclachlan as Cal, Jamie Harris as Gordon, Christine Adams as Agent Weaver, Mark Allan Stewart as Agent Oliver, Blair Underwood as Andrew Garner, Maya Stojan as Kara/Agent 33, Dichen Lachman as Jiaying, Luke Mitchell as Lincoln Campbell, Brendan Wayne as Jiaying's assistant, Robert Reinis as bartender, Daz Crawford as Kebo, Alicia Vela-Bailey as Alisha and Anthony D. Washington as TAC agent #3.

'S.O.S.,' Part One was written by Jeffrey Bell and directed by Vincent Misiano.

'S.O.S.,' Part Two was written by Jed Whedon & Maurissa Tancharoen and directed by Billy Gierhart."

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