The 2-hour Season Finale Of "Marvel's Agents Of S.H.I.E.L.D." is titled "S.O.S.", with Part One written by Jeffrey Bell and directed by Vincent Misiano and Part Two written by Jed Whedon, Maurissa Tancharoen and directed by Billy Gierhart, airing May 12, 2015 on the ABC :
"...'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..."
"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' aka 'Mockingbird'.
Guest stars include Henry Simmons as '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'.
Click the images to enlarge...