This is going to be...wait for it.....wait for it....

[T.G]

Originally Posted by the jiggler

One can only hope the dude from Sherlock is Khan... Has to be.

Khan is a possibility, or at least the long-time speculated favorite, and it's all rumors right now, but word is that's actually Gary Mitchell, Kirk's long time (best?) friend and fellow SF officer. He was the one who, in the first episode of the original series "Were no man has gone before", developed psychic powers, went nuts and tried to kill everyone aboard and destroy the Enterprise.