he was in the first West End production of Cabaret in 1968 opposite Judi Dench. Sallis appeared in the Hal Prince–produced musical She Loves Me in 1963. Though not a success, it led to him making his Broadway debut the following year. Prince was producer of a musical based on the work of Sir Arthur Conan Doyle's Sherlock Holmes called Baker Street. Sallis was asked by Prince to take the role of Dr. Watson to Fritz Weaver's Sherlock Holmes. The show ran for six months on Broadway. Just before Baker Street ended he was offered the role of Wally in John Osborne's Inadmissible Evidence, which had been played by Arthur Lowe in London with Nicol Williamson reprising the lead role. The production was troubled with Williamson hitting producer David Merrick with a bottle and walking out before being persuaded to continue. The show was a minor success and ran for six months in New York, opening at the Belasco Theater before transferring to the Shubert Theater. Sallis reprised his role in the 1968 film adaptation. Television and films Sallis' first extended television role was as Samuel Pepys in the BBC serial of the same name in 1958. He appeared in Danger Man in the episode "Find and Destroy", (1960–1963) he played Armand Lachaume in the Maigret TV series (1961) as Gordon. He appeared in the BBC Doctor Who story The Ice Warriors (1967), playing renegade scientist Elric Penley; and in 1983 was due to play the role of Striker in another Doctor Who serial, Enlightenment, but he had to withdraw and was replaced by Keith Barron. He appeared as schoolteacher Mr Gladstone in an episode of the first series of Catweazle in 1970. He was cast in the BBC comedy series The Culture Vultures (1970), which saw him play stuffy Professor George Hobbs to Leslie Phillips's laid-back rogue Dr Michael Cunningham. During the production, Phillips was rushed to hospital with an internal haemorrhage and as a result, only five episodes were completed. Sallis acted alongside Roger Moore and Tony Curtis in an episode of The Persuaders! ("The Long Goodbye", 1971). He appeared in many British films of the 1960s and 1970s,including Saturday Night and Sunday Morning (1960), Doctor in Love (1960), The Curse of the Werewolf (1961), The V.I.P.s (1963), Charlie Bubbles (1967), Scream and Scream Again (1969), Taste the Blood of Dracula, Wuthering Heights (1970), The Incredible Sarah (1976)