Oliver Johnston worked in a variety of genres and built up a diverse and reputable career. Johnston kickstarted his acting career in various films such as "Indiscreet" (1958), "Son of Robin Hood" (1959) with June Laverick and the James Mason comedy adaptation "A Touch of Larceny" (1960). He also appeared in the adaptation "Kidnapped" (1960) with Peter Finch. He continued to work steadily in film throughout the sixties, appearing in the dramatic adaptation "Francis of Assisi" (1961) with Bradford Dillman, the Patrick McGoohan dramatic adventure "The Three Lives of Thomasina" (1963) and the adaptation "The Tomb of Ligeia" (1965) with Vincent Price. He also appeared in the Marlon Brando comedy "A Countess From Hong Kong" (1967). Film continued to be his passion as he played roles in "It!" (1967) and "A King in New York." Johnston also acted in "The Fast Lady."