Samuel was born in Westminster, London, to the legendary screenwriter Brian Clemens and his wife Janet Clemens, and is related to Mark Twain, being his great, great great nephew, sharing the same name as the revered writer. His father wrote and produced The Avengers (1961), The New Avengers (1976), The Professionals (1977), Thriller (1973) to name but a few. Clemens went to school at Bedford Mode... show more