This made-for-television film was filmed in 1967 (Penman, Margaret; Toronto Telegram News Service. "Toronto's Gift to 'The Avengers'"Ottawa Journal. February 10, 1968, p. 56. Also: Cheshire, Ellen. "A King Among Queens". 1 June 2015.), but IMDB lists the first air date as 1977.
This made-for-television film was filmed in 1967 (Penman, Margaret; Toronto Telegram News Service. "Toronto's Gift to 'The Avengers'"Ottawa Journal. February 10, 1968, p. 56. Also: Cheshire, Ellen. "A King Among Queens". 1 June 2015.), but IMDB lists the first air date as 1977.