McDowell will be appearing in two episodes as Professor Cornwallis, a tough but screwed-up teacher in the school's History department.
You might recognize McDowell from his many film roles like the aforementioned A Clockwork Orange, as well as TV gigs on Franklin & Bash, Entourage, and Heroes.
Community begins Season 4 in its new Friday night time slot on October 19. Keep checking back here for more spoilers as the premiere gets closer!
Source: The Hollywood Reporter