Cathy Gale

Dr. Catherine "Cathy" Gale is a fictional character played by Honor Blackman, on the 1960s British series The Avengers. She was the first regular female partner of John Steed, following the departure of Steed's original male co-star, Dr David Keel (played by Ian Hendry). She made her first appearance at the start of the series' second season in 1962.