Plot summary
With Paige and Ralph stuck on an out of control L.A. Metro subway train, the team must stop it before it derails. They discover that the runaway train's been sabotaged to clear the tracks for a heist to steal a $50 million collection of British gold coins. Walter, with sheer disregard to his personal safety, bravely jumps onto the 90 mph speeding train and successfully stops it from derailing. Paige gets scared of seeing this and due her insecurity of losing Walter, hits him. Later she apologizes to him for her juvenile behavior. Elsewhere, Toby has his first fight and gets knocked out in the boxing ring. Meanwhile, Happy seeks her own distraction from their failed relationship by going out with Chet, who is actually her comedy coach. The men then track her down at a comedy club where she totally bombs her science-based routine that only Sylvester appreciates.
Credits
Adapted from Wikipedia contributors, List of Scorpion episodes. HTML formatting and reference markers removed.