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episode title: Dueling Skates

Air date: 1980-11-27

episode lenght: 30 minutes

When Wheels, the owner of the daycare center, announces plans to level the building, Mork challenges him to a skate-off through the city of Boulder. (source imdb)

IMDB rating: 6.9

This exact episode (3/4): imdb number tt651190

Robin Williams => imdb link: nm0000245
Pam Dawber => imdb link: nm0001118
Conrad Janis => imdb link: nm0417641
Jay Thomas => imdb link: nm0858988
Gina Hecht => imdb link: nm0372958
Jim Staahl => imdb link: nm0820852
Crissy Wilzak Comstock => imdb link: nm0934410
Tom Poston => imdb link: nm0692976
Priscilla Morrill => imdb link: nm0606317
Bill Morey => imdb link: nm0604376
Tom Kindle => imdb link: nm0454305
Reid Smith => imdb link: nm0809681
Bebo => imdb link: nm2856090
Ralph James => imdb link: nm0416850
David Sherrill => imdb link: nm0792679

Most of the info found on this page was found on imdb