Synopsis by Hal Erickson
Barrie Youngfellow guest stars as Debbie, the apparently straight-laced new girlfriend of Jack Tripper (John Ritter). Fearing that Debbie might be shocked at Jack's living arrangement, Janet (Joyce DeWitt) and Chrissy (Suzanne Somers) go to great lengths to convince the girl that they're not Jack's roommates. But as it turns out, Debbie is herself sharing an apartment with two guys. This was the final episode of Three's Company's third season.