Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best
200. The Thames Serpent
Appears in: Thin Ice.
Lord Sutcliffe, who chained this massive monster in the River Thames for her highly profitable poo, is of course the real villain of the piece.
Nevertheless, the Doctor and Bill were taking a huge gamble in freeing the creature because, as Bill pointed out, she could've burst out of the water and eaten half of London. But she didn't - instead swapping a diet of cockneys for cockles.