Already a popular TV comedian in 1956, Benny Hill heads the cast of the zany comedy-mystery Who Done It? Eschewing his usual double entendres in favor of pure-and-simple slapstick, Hill plays a would-be private eye named Hugo. Before he quite knows what's happening, Hugo is up to his neck in espionage intrigue. Belinda Lee plays Hugo's dewey-eyed blonde assistant, George Relph is cast as a flustered Scotland Yard inspector, and David Kossof and George Margo portray a couple of sinister Iron Curtain spies. Who Done It? was scripted by T. E. B. Clarke, a mainstay of the droll Ealing comedies of the early 1950s. The film remained unreleased in the US until the late 1970s, when it was put on the market to cash in on the international success of The Benny Hill Show.