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episode title: P.S. 2001

Air date: 1981-12-17

episode lenght: 30 minutes

Mearth attends school on Ork where hes teased for being an Earth-head. (source imdb)

IMDB rating: 6.9

This exact episode (4/10): imdb number tt651247

Robin Williams => imdb link: nm0000245
Pam Dawber => imdb link: nm0001118
Conrad Janis => imdb link: nm0417641
Jonathan Winters => imdb link: nm0005565
Louanne => imdb link: nm0521608
Maureen Arthur => imdb link: nm0037802
Harvey Lembeck => imdb link: nm0501183
Ralph James => imdb link: nm0416850

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