David Duchovny and Gillian Anderson David Duchovny and Gillian Anderson

There will be a few other familiar faces joining Mulder and Scully on the upcoming X-Files revival.

During Tuesday's appearance on The Late Show with David Letterman, David Duchovny revealed the Cigarette Smoking Man (William B. Davis) and FBI Assistant Director Walter Skinner (Mitch Pileggi) will be back for the six-episode season.

Get the details on The X-Files' return

The Cigarette Smoking Man a.k.a. Cancer Man a.k.a. CSM was Mulder's chain-smoking nemesis. But now that smoking is now a big no-no on network TV (as Constantine learned the hard way), we have to wonder whether CSM will be losing his signature cigarette.