Shadey

Shadeys were an extra-dimensional species, monstrous and rather demonic in appearance and composed of negative energy. They fed off anger and hate and could posses individuals to manipulate their inner darkness.

Two Shadeys, Uncle Bloodfinger and his nephew Woodscrape, were of a particularly wicked nature and scouted out washed up dramatist Robert Greene as he was succumbing from a fatal plague. Stirring his bitterness towards William Shakespeare for upstaging his popularity, they tempted him to murder the playwright. The Ninth Doctor and Rose Tyler convinced Greene to expel the Shadeys from his body and banish them back to their dimension with the promise they would remember him after his demise. (COMIC: A Groatsworth of Wit)