Mr. Sweet has only had one appearance in Doctor Who as of August 2013 and that was in the Series 7 episode The Crimson Horror. He was a red leech who was named Mr. Sweet by a woman called Winifred Gillyflower in 1893. When Winifred was killed, Mr. Sweet tried to escape but he ended up being killed by Winifred's daughter (Ada). Mr. Sweet is one of the most popular recent villains.
