Mindy had been mentioned a couple of times on the show but only made an appearance in two episodes. The first episode, Season 1, Episode 20, The One With the Evil Orthodontist, she is played by Jennifer Grey. In her last appearance, Season 2, Episode 24, The One With Barry and Mindy's Wedding, she is played by Jana Marie Hupp.
There were two:
Robin Williams who played the lead, Mork from Ork, and Jonathan Winters who played Mearth, the son of Mork and Mindy in the last season.
Robin Williams
Mindy was played by Jennifer Grey
Robin Williams .
Pam Dawber
Ralph James
Robin Williams
Mork & Mindy
Robin Williams .
My Sister Sam
Mork and Mindy - 1978 Mork Gets Mindy-itis 2-7 is rated/received certificates of: Argentina:Atp
Robin Williams
Mork & Mindy
Robin Williams.
Robin Williams .
Mork and Mindy - 1978 Mindy and Mork 3-21 is rated/received certificates of: Argentina:Atp
That would be "Robin Williams".
My Sister Sam
Mork and Mindy - 1978 Mindy and Mork 3-21 was released on: USA: 7 May 1981
Mork and Mindy - 1978 Mork vs- Mindy 2-6 is rated/received certificates of: Argentina:Atp
I believe you are thinking of Robin Williams.
Mork and Mindy - 1978 Mork Gets Mindy-itis 2-7 is rated/received certificates of: Argentina:Atp
Mork and Mindy - 1978 Mama Mork Papa Mindy 4-5 was released on: USA: 5 November 1981