Mary Lynn Rajskub Mary Lynn Rajskub

24: Live Another Day's Jack Bauer is in for a big surprise.

On Monday's penultimate episode (9/8c, Fox) Jack (Kiefer Sutherland) and Kate (Yvonne Strahovski) continue their pursuit of the override device only to learn that it's now in the hands of someone far more dangerous than the recently deceased Adrian Cross (Michael Wincott).

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In the exclusive, behind-the-scenes preview below, Jack and Kate finally evade a group of trigger-happy Russians only to realize that all the members of Adrian's Open Cell have been killed. Well, everyone except Chloe (Mary Lynn Rajskub

), who, like the override, has gone missing. However, Kate quickly finds a hint that Chloe presumably left behind: a recording of Cheng Zhi (Tzi Ma), the man who tortured both Jack and Audrey (Kim Raver) and who has now framed the U.S. in the bombing of a Chinese carrier ship."Do you recognize the voice?" Kate asks. "I'll never forget it," Jack replies.But what is Cheng's endgame? ("China turned its back on me. It's not my country anymore, " he tells Chloe.) And can Jack and Kate save Chloe from the same kind of torture Jack and Audrey (barely) survived? Watch the clip below, featuring teases from executive producers Evan Katz and Manny Coto, and check out 24: Live Another Day Monday at 9/8c on Fox. (Watch past episodes here.)