Dick and Mary visit Rita, a psychic, together, and Dick scoffs that the whole thing's a rip-off-until the psychic says that Dick and Mary are from two different worlds. She adds that one of these days Dick will leave Mary and go back where he came from. Dick immediately decides that he should devote himself to locating his successor, someone worthy who will wait in the wings until Dick has gone. Later, Sally tells Harry that if the psychic talked about Dick's leaving the planet, she must know they're aliens; they have to kill her. Dick takes Mary to a singles bar in search of the perfect replacement, but he acts so strangely that the bartender thinks Mary's a hooker and asks them to leave. Harry and Sally set about hatching wildly unrealistic plots designed to do away with the psychic. Nina tells Dick about Gary Hemmings, a visiting lecturer who's dying to substitute for him. Dick talks with Gary and offers him the chance to replace him; Gary thinks he's being offered a staff position at the University. Gary's a bit puzzled when Dick insists that he meet Mary, saying that if Mary doesn't like him it will never work. Harry and Sally visit the psychic. Harry gets her in a headlock and smears honey on her blouse. Unfortunately, he's forgotten to tell Sally that his plan involves killer bees, so she can't supply them at the crucial moment. Dick, Gary and Mary meet in a restaurant, and Dick embarrasses and puzzles Mary as he attempts to play matchmaker. Harry and Sally re-visit Rita, who wants to throw them out, but they manage to get her to talk about herself, and she confides that she's always pictured herself dying during a passionate night of lovemaking. Harry's not sure he's up to doing the job, and Dick shows up and says he needs to speak to Rita first. He wonders how much time he has left; Harry tells Dick that however much time he has from now on, he's just a temp. Dick tells Gary he has the job and will probably be in the sack with Mary that evening. Gary protests that he won't sleep with Mary to get the job, and Dick says that sleeping with Mary is the job. In that case, Gary, who only wants a chance to teach physics, is having no part of it. When Mary finds out what's been going on, she's afraid that Dick might be dying, but he explains that he was just spooked by what the psychic had to say, and now he's decided he doesn't want to be replaced.