fadedsignals:

“Three’s Company” aired on ABC from 1977 to 1984.  Based on a British sitcom, the half-hour series starred John Ritter, Joyce DeWitt and Suzanne Somers.  In later seasons, Jenilee Harrison and Priscilla Barnes replaced Somers.   IMDB sums up the show thusly:

The misadventures of two women and one man living in one apartment and their neighbors.

The series became a huge hit for ABC.  It went into local syndication in 1982.  

Here’s a sample of the show’s opening titles:

The show created two spinoff series.  “The Ropers,” aired for two seasons on ABC.  After the conclusion of “Three’s Company,” “Three’s A Crowd” lasted for one season on ABC.

Source: Wikipedia (”Three’s Company”)