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In page Joan Rivers:

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By the 1970s, Rivers continued to be a prominent fixture on television. Along with her other guest-spots on the late-night circuit, she also made appearances in The Carol Burnett Show, had a semi-regular stint on Hollywood Squares and guest-starred in Here's Lucy. Rivers made her Broadway debut in the play Fun City, which opened on January 2, 1972 and co-starred Gabriel Dell, Rose Marie and Paul Ford. It ran for only nine performances amid a negative critical reception. Though a New York Times reviewer criticized the production as "frenetic to the point of being frazzled," he praised Rivers as "a deft comedy writer" and "a very funny lady."[1] From 1972 to 1976, she narrated The Adventures of Letterman, an animated segment for The Electric Company.