Winifred Gillyflower
From Tardis Wiki, the free Doctor Who reference
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 own poison. The Doctor, Clara, Madame Vastra And Jenny successfully stopped this evil plot.