Sadly, Sylvester McCoy didn't have many truly amazing stories. The haemovores (a bold sucking offshoot of humanity from the distant future) is featured in one of those stories. The Curse of Fenric has the titular Cillian bringing these vampiric beasties from the future to 1940's North Umberland to defeat the Doctor. Some of them, like the one I sketched, spent some time under water and become bloated and grew barnacles . Let's see what you've got and I'll get back on schedule .