Winifred Gillyflower

Winifred Gillyflower was a mad old woman. Winifred allowed a red leech she nicknamed Mister Sweet to live on her chest, feeding on the nectar of Winifred herself. She planned to poison the air with Mister Sweet's own poison. The Eleventh Doctor, Clara, Madame Vastra and Jenny Flint successfully stopped this plot, and Strax killed her. (TV: The Crimson Horror)