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The first Mark Goodson-Bill Todman production to be seen on British television, the BBC's version of What's My Line? was a virtual carbon copy of the American original, which ran on CBS from 1950 to 1967. Boasting a number of hosts during its lengthy run, the British edition featured a panel of celebrities who tried to guess the identities and occupations of various "civilians." At the end of each program, the blindfolded panelists tried to identify a famous "mystery" guest. Debuting in England in 1951, What's My Line ran until 1962, then was revived by the BBC from 1973 to 1974. A later British version aired over Thames Television from 1984 to 1990.