Zack, Slater, Screech, Kelly, Jessie, and Lisa travel to a secluded mansion for a murder mystery weekend after Jessie wins a radio contest in this 1991 episode. They quickly come to suspect a real killer is on the loose somewhere on the grounds, and Zack has to act as detective. Although everyone makes it out alive, we just wish he would've discovered what supernatural entity possessed Lisa and forced her to wear that heinous rainbow blazer . . .