Comic book nerds can rest easy: After airing three episodes,
The new series, an offshoot of Joss Whedon's blockbuster movie
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.