ABC and Marvel Entertainment have released some promo photos for the first half of the season finale of “Marvel’s Agents of S.H.I.E.L.D.” which you can check out in the gallery below. Titled “S.O.S.,” the episode is officially described as follows:

“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.”

“S.O.S.,” Part One was written by Jeffrey Bell and directed by Vincent Misiano, both parts are set to air on May 12. “Marvel’s Agents of S.H.I.E.L.D.” airs Tuesdays at 9 P.M. EST on ABC.

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.

“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.

You can catch up on season two of the series by reading our recaps by clicking here.