Mr. Belvedere -S06E18-Bad Marsha

Filmed Winter/Spring 1990, but not aired during the original run. Visiting a client in jail, Marsha comes face-to-face with Sharon Whit (Ilene Graff in a dual role), an exact Marsha lookalike. During their consultation, Sharon knocks out Marsha and switches places with her, leaving Marsha trapped in prison while Sharon moves into the Owens' household, although the Owens grow suspicious of her strange behavior, while Marsha desperately tries to convince the guards that she is not Sharon. When she sings a guard out of a hostage crisis, she returns home just as the family confronts her, thinking she is Sharon - when she wakes up, a victim of a nightmare caused by anxiety about a test in law school. Guest starring Rose Marie