The Odd Couple focuses on two very different divorced men that share an apartment in Manhattan. It began life as a 1965 Broadway play by Neil Simon, which then became a 1968 film starring legendary actors Jack Lemmon and Walter Matthau.
Due to the film's box office success, ABC chose to bring the duo of uptight Felix Ungar and sloppy Oscar Madison to its air in 1970. Now starring Tony Randall and Jack Klugman, the series quickly became a critical darling, although it didn't draw the ratings to match.
The Odd Couple may today be considered one of the greatest sitcoms ever, but it was canceled multiple times, only to be revived later. A total of 5 seasons were produced, and Randall and Klugman's portrayals of Felix and Oscar are now generally considered the definitive renditions of the characters.