America's Got Talent Seven of 12 acts move on to the semifinals and a surprise guest performs. 8 p.m. NBC
Vixen Originally produced as a Web series, this animated two-hour special recounts the adventures of DC Comics character Mari McCabe (Megalyn Echikunwoke), an orphan who fights crime using her power to mimic the abilities of any animal who ever lived on Earth. With the voices of Neil Flynn, Sean Patrick Thomas and Anika Noni Rose. 8 p.m. KTLA
MasterChef This new double episode features a Mexican-themed tag-team challenge before the cooks head to Big Bear Lake to cook fresh fish. 8 p.m....