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episode title: Mork and the Immigrant

Air date: 1979-01-11

episode lenght: 30 minutes

Mork meets Sergei, a Russian immigrant, and invites him to live with them. After Sergei refers to himself as an alien, Mork becomes convinced that he himself has to register with the government as an alien. (source imdb)

IMDB rating: 7.4

This exact episode (1/13): imdb number tt651222

Robin Williams => imdb link: nm0000245
Pam Dawber => imdb link: nm0001118
Elizabeth Kerr => imdb link: nm0449688
Conrad Janis => imdb link: nm0417641
Tim Thomerson => imdb link: nm0859772
Ned Wertimer => imdb link: nm0921624
Ralph James => imdb link: nm0416850

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