Rangorr

Rangorr was a Brainleader of the Kreech who waited to find an intelligent mind to take his place so that he could leave his responsibilities for the colony and go travelling amongst the stars.

Rangoor believed he had found a replacement when the Eleventh Doctor was captured. However, the Doctor managed to escape during a contest to find the cleverest. He won whilst Rangoor was distracted by a crossword puzzle. (DWAM: The Cleverest King)