The X-Files season finale promo goes out in 'deafening silence'

Prepare yourself for the truth: The X-Files’ six-episode event series comes to an end on Monday, and it’s going to be “shocking.”

The promo for the season 10 finale finds Scully (Gillian Anderson) teaming up with Einstein (Lauren Ambrose) to investigate the possibility that alien DNA could be “lurking in every American citizen.” Could that DNA explain why so many people — including Einstein and Tad O’Malley (Joel McHale) — seem to be coming down with a mysterious illness? And is Mulder (David Duchovny) sick too, or is he just recovering from a confrontation with the Cigarette Smoking Man (William B. Davis)?

“You set this in motion,” Mulder accuses his seemingly unflappable opposition, gun to his head. “Now you’re going to put a stop to it.”

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Series creator Chris Carter tells EW that the finale is “the answer to the question posed by the first part of the two-parter [the season premiere],” though that answer doesn’t seem like it will be an easy one: At TCA, Carter confirmed that the episode ends on a cliff-hanger.

“It would now appear we go out with a deafening silence,” O’Malley declares.

Check out the trailer above. The X-Files’ season finale airs Monday Feb. 22 at 8 p.m.