When does Young Person's Guide to History return?

Adult Swim is an American adult-oriented television programming block aired by the American basic cable channel Cartoon Network. Launched on September 2, 2001, Adult Swim has frequently aired animated sitcoms, adult animation features, parody, satire, mockumentaries, sketch comedy, and pilots. The block grew out of Cartoon Network's previous attempts at airing content appropriate for adults who might be watching the channel after 11 pm (ET/PT)