The cast of "Marvel's Agents of S.H.I.E.L.D." October 10, 2013, 10:45 a.m. Comic book nerds can rest easy: After airing three episodes, ABC has picked up "Marvel's Agents of S.H.I.E.L.D." for a full season. The new series, an offshoot of Joss Whedon's blockbuster movie "The Avengers," will get a 22-episode run, Paul Lee, president of ABC Entertainment Group, said in a statement Thursday. The series, which airs Tuesdays at 8 p.m. ET/PT, opened last month with a strong 4.0 rating in the key 18-49 age demographic, but has slipped in the following weeks. It has gotten a significant lift from people watching episodes through digital video recorders and video-on-demand. It is ABC's first new series to get a full-season order. The network last week canceled another new show, "Lucky 7," after just two episodes, making it the first casualty of the fall season.