A.P. Bio is back in session! Season 4 of the critically-acclaimed comedy series returns to the halls of Whitlock High for more laughs and misadventures with Advanced Biology teach Jack Griffin (Glenn Howerton) and his lovable roomful of honor roll students. Patton Oswalt is back as the adorable Principal Durbin alongside fan-favorite Paula Pell as Durbin's secretary Helen, plus Mary Sohn, Lyric...
