Doctor What's slightly less evil other cat, a male stray adopted initially against his will by his former roommate Audrey. Despite the fact that Audrey is no longer Doc's roommate, the cat remains in his apartment. Doc has already planned for the worst and has the name 'Lynx' lined up for when Audrey visits again.
Pictures of Sphinx always show him as a brown and white cat who has a perpetually 'stoned look' on his face.
Sadly, after being with him for ten years, Sphinx had to be euthanized on October 7, 2015.