However, he did write episodes for the US TV series Darkroom (ABC-TV, 1981–1982), Remington Steele (NBC, 1982–1987), and Max Monroe: Loose Cannon (CBS, 1990). Back in the UK, he worked on BBC TV's Bergerac (1981–1991), the anthologies Hammer House of Mystery and Suspense (ITV, 1984–1986) and Worlds Beyond (ITV, 1984–1989), and adapted Gavin Lyall's espionage thriller The Secret Servant as a three-part drama for BBC TV (1984). He then, in the US again, worked on the Father Dowling Mysteries (NBC, 1989; ABC-TV, 1990–1991), as executive script consultant for the feature-length revival series of Raymond Burr's Perry Mason (CBS, 1985–1995) for which he also wrote three teleplays. He also wrote for the Dick Van Dyke mystery series Diagnosis: Murder (CBS, 1992–2001). He also wrote for the Bugs TV series in the UK (BBC, 1995–1999) and Highlander: The Series in the US. Clemens' final credit was for Jane Doe: How To Fire Your Boss in 2007. Films In 1971, he wrote and produced for Hammer Film Productions Dr. Jekyll and Sister Hyde and, in 1972, wrote and directed Captain Kronos – Vampire Hunter (his only directorial effort). He also wrote the screenplays and/or stories for the feature films Operation Murder (1957), The Tell-Tale Heart (1960), Station Six-Sahara (1963), The Peking Medallion (1967), And Soon the Darkness (1970), See No Evil (1971), The Golden Voyage of Sinbad (1973), The Watcher in the Woods (1980), and Highlander II: The Quickening (1991). Selected filmography At the Stroke of Nine (1957) Operation Murder (1957) The Betrayal (1957) Moment of Indiscretion (1958) (co-written with Eldon Howard) Woman's Temptation (1959) An Honourable Murder (1960) Identity Unknown (1960) The Tell-Tale Heart (1960) Return of a Stranger (1961) Station Six-Sahara (1962) The Corrupt Ones (1967) And Soon the Darkness (1970) Blind Terror (also known as See No Evil; 1971) Dr. Jekyll and Sister Hyde (1971) The Golden Voyage of Sinbad (1973) Captain Kronos – Vampire Hunter (released 1974; filmed 1972) (also director) The Watcher in the Woods (1980) Highlander II: The Quickening (1991) Justine: A Private Affair (1995) Theatre In 1988, Clemens wrote the play Holmes and the Ripper, which was inspired by Stephen Knight's book Jack the Ripper: The Final Solution. The play has the great detective Sherlock Holmes and his colleague Dr. Watson become embroiled in the grisly murders in Whitechapel in 1888. The play would be adapted into an audio drama by Big Finish Productions. In 2008