С 3, с 4: Sam and Jay hope to impress some cool friends from the city with a Halloween party at the mansion. But when Pete's ex-wife, Carol, drops by unannounced - and significantly overstays her welcome - Sam worries that her presence will spoil the event. Meanwhile, after accidentally summoning Molly from the beyond last year on Halloween, the ghosts decide to host a seance to bring back their recently departed friend.