Sir Malcome Canker was a priest in the 16th century. In 1590, he was a member of the English delegation sent to the Moon in Iris Wildthyme's TARDIS to open diplomatic relations with the Lunaries, accompanied by his servant, Harry Peerless. Unlike his fellow delegate, Sir Jack Fuller, he disliked the Lunaries' hedonistic culture, and secretly worked with Duke Ferdinand to sabotage England's bid to ally with them. After Fuller was poisoned with Hydra venom, Canker's treachery was exposed and he was given the choice of returning to London to be executed, or staying on the Moon. (PROSE: Minions of the Moon)

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