The Apartment is the nineteenth episode of Season 7 of Three's Company, and the 147th overall episode of the series. Written by Shelley Zellman and directed by Dave Powers, it first aired 22 March 1983 on ABC.
In order to meet his busy schedule, Jack decides to sleep at the dingy apartment above his restaurant and imposes on the girls to help him do errands. When Jack sleepily goes up to the apartment, he discovers Mr. Angelino is using it to have an affair with a young woman, Daphne. Before Jack can excuse himself, Mrs. Angelino arrives, and Mr. Angelino pawns Daphne off as Jack's date, making a hasty exit.
Daphne, upset upon discovering Mr. Angelino's married, begs Jack to stay and have a glass of wine. Janet and Terri arrive to surprise Jack with some cheerful knick-knacks. When the girls meet Daphne, they think Jack has been lying to them, and storm home furious! Jack tries to explain to them but the girls refuse to listen.