3rd Rock from the Sun (1996)
S06E11 A Dick Replacement
Episode Overview
Dick and Mary go to see a psychic, who reveals that they come from separate worlds and ominously forecasts that Dick will eventually abandon Mary. Disturbed by this revelation, Dick takes it upon himself to find a new boyfriend for her and chooses a man named Gary, who mistakenly believes he’s being considered for Dick's job as a physics professor. Meanwhile, Sally and Harry conclude that if the psychic is aware of their alien origins, they must eliminate her—but they plot to do so in a way that she can’t foresee.