Plutonium is the new diamond during Scorpion's "Plutonium is Forever."

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Walter O'Brien's (Elyes Gabel) team is enlisted to keep a Los Angeles nuclear reactor from going critical, but the addition an old team member may make the job a little more chaotic then normal (yes, that's possible).

Mark Collins' (Joshua Leonard) proficiency is unknown, but it is clear he is far from Toby's favorite person and is just a teeny tiny bit paranoid (see video below). Fortunately, Collins' is in prison. Unfortunately, he will eventually find himself running around a failing reactor with Walter, Paige (Katharine McPhee), Cabe (Robert Patrick), and Sylvester (Ari Stidham).

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Meanwhile, Walter and Cabe will have a little trouble escaping that ill-fated reactor. Despite the team's best efforts, their supervisor will get left behind, and the geniuses will have less than an hour to figure out how to save him (see second video below).

Following "Plutonium is Forever," Scorpion will air "True Colors," "Father's Day," "Risky Business," and "No Man Left Behind."

Scroll through the photos above and catch Scorpion Mondays at 9 p.m. ET to find out more.