Three's Company : Eleanor's Return (1978)
Directed by Dave Powers
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Synopsis by Hal Erickson
Marianne Black guest stars as Eleanor, former roommate of Janet (Joyce DeWitt) and Chrissy (Suzanne Somers). Stumbling upon Eleanor while she's taking a shower, Jack (John Ritter) suspects that the girls are planning to welcome their old roomie back -- and throw him out. The misunderstanding reaches an absurd climax with a surprise party and a very "revealing" appearance by the hapless Larry Dallas (Richard Kline).