It's the Great Pumpkin, Charlie Brown (8pm, ABC) - In this 1966 classic, the Peanuts gang celebrates Halloween with Linus hoping he'll be visited by The Great Pumpkin.
Community (8pm, NBC) - Britta fears someone in the group is a sociopath after her anonymous personality test turns up with unsettling results. In order to find out who's disturbed, she and Jeff persuade the gang to tell horror stories.
Parks and Recreation (8:30pm, NBC) - Andy and April host a Halloween party at their house and Tom emcees an event for Leslie's campaign.
Project Runway (9pm, Lifetime) - In the Season 9 finale, the final designers frantically ready their collections in a bid to be the best at Fashion Week. Designer L'Wren Scott is the guest judge.
The Secret Circle (9pm, CW) - Cassie throws a Halloween party, but it takes a dangerous turn when some uninvited guests who have their sights set on the circle show up.
Prime Suspect (10pm, NBC) - As Jane investigates the murder of a young woman whose body was found in the park, Duffy and Evrard search for the stepfather of the murder victim.
The Mentalist (10pm, CBS) - A police chief is murdered in a resort town, and the case leads Lisbon to reunite with her brother, a bounty hunter who's searching for a bail-jumper.