3rd Rock from the Sun - Season 5 - Eps 19: Frankie Goes to Rutherford
Frank, a former student of Mary's, returns for a lecture series, making Dick jealous, and paranoid that he is after her. When confronting Frank, however, he hints that he is gay, but Dick misreads him and is convinced that he is hinting at being an alien. Therefore, Dick begins to regularly accompany Frank to Geoffrey's Lounge, which he thinks is an alien bar. Meanwhile, Sally, Harry and Tommy receive a visit from Don, who has just inadvertently foiled a bank robbery, and decide to use their superior knowledge to rob a bank themselves. As the episode progresses, each of the Solomons dons a costume of one of the Village People (Dick as the construction worker, Harry as the indian, etc). At the end of the episode on their porch roof get-together, they are joined by Don in his police uniform to complete the tableau, and the episode ends to a Village People song.
About 3rd Rock from the Sun

Title: 3rd Rock from the Sun
First Air Date: 1996-01-09
Last Air Date: 2001-05-22
Status: Ended
Rating: 7.5/10 (from 503 votes)
Language: EN
Seasons: 6
Total Episodes: 139
Network: NBC
Genres: Family, Sci-Fi & Fantasy, Comedy, Drama
Production Companies: Carsey-Werner Company
Synopsis
The high commander of an alien expedition lands on Earth -- what he considers to be the least-important planet -- in human form as Dick Solomon. Along for the ride are his alien compatriots Harry, Sally and Tommy -- who is the eldest of the group but is now angrily trapped in a teen's body.
Cast

John Lithgow
Dick Solomon

Kristen Johnston
Sally Solomon

Jane Curtin
Mary Albright

Joseph Gordon-Levitt
Tommy Solomon

Elmarie Wendel
Mamie Dubcek

French Stewart
Harry Solomon

Simbi Khali
Nina Campbell

Wayne Knight
Don Orville