The show focuses on a group of tenants in an office building located at 99 Sumach Street,
Toronto.
Rosemary Radcliffe played the title character, aspiring Canadian documentary film-maker Rosie Tucker.), left
Coming Up Rosie after the first season. Aykroyd also left the show after its first season, although he returned in the second season opener as a special guest. Later cast members—replacing Aykroyd and Reid—included
John Candy as Wally Wypyzypychwk, the Ukrainian owner of Sleep-Tite Burglar Alarms, and
Catherine O'Hara as answering service operator Myrna Wallbacker. Both Candy and O'Hara also starred in
Second City Television, actually appearing on
Rosie concurrently with their early episodes of SCTV, which began in September 1976. Candy was also a regular on the sitcom
The David Steinberg Show (1976–77) during this period, thereby simultaneously appearing as a regular on three separate series for three different Canadian networks. Guest performers on the show in individual episodes included
Jayne Eastwood, and from SCTV,
Eugene Levy and
Dave Thomas. Many of the actors in this series also appeared in the less successful 1974–1975 CBC series
Dr. Zonk and the Zunkins. ==Broadcast==