Cos was an American sketch comedy

Sketch comedy

A sketch comedy consists of a series of short comedy scenes or vignettes, called "sketches," commonly between one and ten minutes long. Such sketches are performed by a group of comic actors or comedians, either on stage or through an audio and/or visual medium such as broadcasting...

/variety

Variety show

A variety show, also known as variety arts or variety entertainment, is an entertainment made up of a variety of acts, especially musical performances and sketch comedy, and normally introduced by a compère or host. Other types of acts include magic, animal and circus acts, acrobatics, juggling...

 TV series that debuted on the ABC Network

American Broadcasting Company

The American Broadcasting Company is an American commercial broadcasting television network. Created in 1943 from the former NBC Blue radio network, ABC is owned by The Walt Disney Company and is part of Disney-ABC Television Group. Its first broadcast on television was in 1948...

 in September 1976. It was hosted by comedian Bill Cosby

Bill Cosby

William Henry "Bill" Cosby, Jr. is an American comedian, actor, author, television producer, educator, musician and activist. A veteran stand-up performer, he got his start at various clubs, then landed a starring role in the 1960s action show, I Spy. He later starred in his own series, the...

 and featured an ensemble cast who would perform sketches each week. The show was unsuccessful in the Nielsen ratings

Nielsen Ratings

Nielsen ratings are the audience measurement systems developed by Nielsen Media Research, in an effort to determine the audience size and composition of television programming in the United States...

 and was cancelled by November 1976.

Cosby appeared on this series concurrently with his starring role in Fat Albert and the Cosby Kids

Fat Albert and the Cosby Kids

Fat Albert and the Cosby Kids is an animated series created, produced, and hosted by comedian Bill Cosby, who also lent his voice to a number of characters, including Fat Albert himself. Filmation was the production company for the series. The show premiered in 1972 and ran until 1985...

and the film Mother, Jugs & Speed

Mother, Jugs & Speed

Mother, Jugs & Speed is a 1976 black comedy film directed by Peter Yates. It stars Bill Cosby , Raquel Welch , Harvey Keitel , and Larry Hagman as employees of an independent ambulance service trying to survive in Los Angeles.-Plot:...

.