You're That Guy...From That Thing! 2

In a similar vein to Shough's previous post about people who keep popping up from other things on 24 recently, I've noticed a lot of people, whilst I've been watching the 1st season of The X Files on DVD, who have gone on to be in other things:

The insane doctor woman/clone in Eve is Frasier's agent in...well Frasier!
The two doctors in Ice were one of the women in Desperate Hosewives and one of the previous heads of CTU in 24.
Shough already mentioned it, but the guy in Fire was just in 24.

Hmmm...I'm sure there were some more, but I can't remember them.