Scorpion's Walter O'Brien and Cabe Gallo will reignite the Baghdad dispute during "Cliffhanger."

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Cabe (Robert Patrick) recently revealed that Walter (Elyes Gabel) doesn't know the full truth about Homeland's use of his software in Iraq, but the genius will find out more than he wants to know during the freshman series' penultimate episode.

"I think you're going to see more stuff with me and Merrick [played by David Fabrizio] with what actually happened in Iraq and when we lied to Walter and why we did that, what was up with that," Patrick informed Assignment X. "Walter feels betrayed and I'm really trying to nurture that relationship. I'm trying to gain his trust again, and that's a lot of what's going on with him."

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This trust will be shattered, however, when the team takes on a case regarding a sarin gas leak. The mission will somehow prompt Cabe to reveal the truth he has been hiding all season, and Walter will immediately want him out of the picture.

"I want him off Scorpion, end of story," Walter yells in a new promo for "Cliffhanger" (see video below).

Find out is the team will meet it's end when Scorpion airs Mondays at 9 p.m. ET on CBS.

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Scorpion, Television, CBS