Mark and Randall go down to Hell to spend Halloween with Callie's family, who have some special plans for Mark.
Mark tries to help Leonard with his wand issues, disastrously; Twayne meets his soulmate.
Mark has to deal with a clingy new roommate after Randall leaves to join a zombie cult.
A Kong is put on leave from his job after suffering an OCD attack, leaving it up to Mark to help find him work. Unfortunately, budget cuts have forced Twayne to shut down Mark's department for the rest of the year, just in time for him and Callie to attend the lavish Demon Convention in Atlantic City. As Callie battles her sudden unexplained attraction to Twayne, Mark and a recently bisected Randall make their way to Atlantic City to get Social Services reinstated, so that Kong (and Leonard) can get back to work.