After lapsing into a comatose state, a rocket scientist suddenly disappears from view. Investigating the situation, Steed and Cathy discover that the missing scientist was deeply influenced by the occult. When the man is found dead, the Avengers immerse themselves in the world of Black Magic to uncover the killer. Intended as Cathy Gale's introductory episode, "Warlock" had to be extensively re-edited when it was decided to delay its telecast until January 26, 1963, by which time Cathy was firmly established on the series. Written by Doreen Montgomery, the episode didn't make it to American television until February 20, 1991. ~ Hal Erickson, Rovi