Gein

Gein was a Brandragian whose organic craft (a Class lll Brandragian freighter) crashed into the North Sea before the Second World War. Gein had managed to disguise himself as human and some time later, as a crew member of a submarine, hijacked a naval sub which he used to return to his craft. Unfortunately the ship had not completed its repairs. The arrival of the Doctor, Amy Pond and Rory Williams in the TARDIS meant that Gein managed to return home by accepting a lift in the TARDIS. So that the craft wasn't discovered by the Nazis and potentially change history, the Doctor managed to change the ship's biocomposition – making it an attractive, tasty and digestible food for the sea life which quickly began to consume it as it decomposed before it was discovered. (DWAM: Sub-species)