I don't watch this show, but isn't the bald guy the actor who planned Skinner (Scully and Mulder's senior FBI director) in the X-Files?
That's the guy, joined the show this season.
Mitch Pileggi showed up on "Stargate SG-1" as Col. Steve Cadlwell, Officer In Charge of the "Prometheus" and has had his character slip over to "Atlantis".
A very smart move. Along with moving Lexa Doig ("Andromeda" and Mrs. Michael Shanks) to "SG-1".
Jack.