Kidder's first major feature was the 1969 American film "Gaily, Gaily", a period comedy starring Beau Bridges, in which she portrayed a prostitute. She subsequently appeared in a number of TV drama series for the CBC, including guest appearances on "Wojeck", "Adventures in Rainbow Country", and a semi-regular role as a young reporter on "McQueen", and as a panelist on "Mantrap" which featured discussions centered on a feminist perspective. During the 1971–72 season, she co-starred as barmaid Ruth in "Nichols", a James Garner–led Western, which aired 22 episodes on NBC.