Sister Terri is a sitcom pilot starring Pam Dawber as a former gang leader who's renounced her ways and become a nun. Instead of creating a pilot for Mork & Mindy, the producers cut footage of Mork's first Happy Days episode together with shots of Dawber from this unsold pilot. This was done without Dawber's knowledge, and she only learned she'd been cast in the show after her agent read it in Variety.