‘AP Bio’ returns on Peacock, and they’re “going for it,” says lead Glenn Howerton Friday, September 3 by ABC News(NOTE LANGUAGE) NBC's sitcom AP Bio just returned for a fourth season on Peacock.The series stars It's Always Sunny in Philadelphia lead and co-creator Glenn Howerton as Jack Griffin, a former Harvard philosophy professor begrudgingly tasked with teaching at his hometown high school in Ohio.Instead of teaching, however, he sets his... Read More.