The fight for the holodeck is on! The Halloween "away" team, consisting of Troi as the Mummy, Riker as the Werewolf, Picard as Mr. Hyde, and Worf as an amphibious Klingon Mkr'an, are being chased by a mob of crazed Redjac-controlled crew members. Meanwhile, Dr. Crusher and Commander La Forge monitor their crewmates' neural outputs in a frantic attempt to keep them from entering irreversible states of psychoses and fully integrating with their monster personas.