EXCLUSIVE: Jack Reveals His History With Riley's Mother on 'MacGyver' -- Watch!

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Riley, Riley, Riley!

Friday's episode of MacGyver is all about our favorite computer hacker, who's about to start World War III after hacking the NSA -- unless MacGyver (Lucas Till) and Jack (George Eads) can find her first.

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ET has an exclusive sneak peak of this week's episode of the CBS action drama, in which Jack's quest to find Riley (Tristin Mays) involves meeting up with someone from her past… and his.

"So when you told me you were a bathroom tile salesman," Riley's mother, Diane (Michael Michele) asks Jack as the two meet up on a park bench.

"Yeah, I was lying," Jack admits. "I'm sorry about that. Look, it's a long story, Diane, but I work for a secret U.S. government organization, and well, I guess it's not that long of a story."

"How does Riley fit into this?" Diane replies, still unaware of her daughter's line of work.

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"We recruited her, got her out of prison," Jack explains.

"I guess I should thank you for that, and for saving my life. But it seems that you've dragged Riley into a very dangerous line of work," Diane says. "Do you remember the first time I let you watch Riley for me? Do you remember what I said?"

Find out what Riley's mom said -- and just how fierce she can be -- in the video above.

airs Fridays at 8 p.m. ET/PT on CBS.

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