The Shalka Doctor is the original Ninth Doctor played by Richard E. Grant back in 2003. Grant knew nothing of the programme and barely even managed to phone it in.
Shalky appeared in the Paul Cornell webcast Scream of the Shalka and was promptly forgotten when Ecclescake came along. Also stars in Withnail and I.
He was gay for the Mattress and no, that's not a joke, that's 100% canon. Even more canon than the story.