"This-- This is war." Two-hour season finale tonight at 9 p.m. ET on ABC. Please note, this thread may contain spoilers and references to the Marvel Cinematic Universe. "S.O.S." - Season Finale Tuesday, May 12, 2015 @ 9 p.m. ET/8 CT on ABC S.H.I.E.L.D. puts it all on a line to survive a fight that blurs the line between friend and enemy. #2.19: "Scars" ABC.com - Marvel's Agents of S.H.I.E.L.D.