Which of these iconic 1970s sitcom stars made his first primetime appearance on The Mary Tyler Moore Show?

Answer Henry Winkler

A year before becoming "The Fonz", Henry Winkler appeared on The Mary Tyler Moore Show. In "The Dinner Party" (Season 4, Episode 10), Winkler plays Steve Waldman, Rhoda's (uninvited) date to Mary's disastrous dinner party.

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