One last mission: Marvel’s Agents of S.H.I.E.L.D. ended its seven-year run with a two-part finale. Agent Phil Coulson and his plucky team of superheroes battled an alien race of Chronicoms in a high-octane journey through multiple time periods in the seventh and final season of ABC's Agents of S.H.I.E.L.D. It has always been a fun show, even when the narrative occasionally went bonkers—honestly, especially then—with compelling characters that kept you coming back each week.