From Wikipedia
The Brady Bunch Variety Hour was a television series produced by Sid and Marty Krofft in association with Paramount Television, which aired on ABC between 1976 to 1977.
The series starred the original cast members of The Brady Bunch, with the exception of Eve Plumb who was replaced by Geri Reischl, who was also known as "Fake Jan". The show began as a 60-minute special titled The Brady Bunch Variety Hour on November 28, 1976. This special led to eight additional 60 minute episodes produced and aired as The Brady Bunch Hour from January to May 1977.
Original run November 28, 1976 – May 25, 1977
Genre Variety show
Created by Sid and Marty Krofft, based on the original TV series created by Sherwood Schwartz
Starring
Robert Reed
Florence Henderson
Barry Williams
Maureen McCormick
Christopher Knight
Geri Reischl
Mike Lookinland
Susan Olsen
Ann B. Davis
Rip Taylor