Team Scorpion must find a boy from Ralph's class who goes missing on a field trip after he accidentally has a run-in with a deadly criminal; Toby gets closer to finding out the identity of Happy's husband.
Team Scorpion's simple job at the Los Angeles Natural History Musuem turns deadly when they discover thieves robbing a rare exhibit, needed to enrich a nuclear bomb.
Team Scorpion explores a deep cave system in an effort to prevent a bat population from harming the North American ecosystem; the team dons Halloween costumes for Walter's impending immigration inspection.
When Team Scorpion is duped into producing counterfeit money for a foreign entity intent on ruining the U.S. economy, Paige must rely on her mother Veronica's skills as a grifter to save them.
Walter and Sylvester enter an international chess competition under cover on foreign soil for Team Scorpion in order to extricate a U.S. spy before her identity is exposed.
When a simple mission to protect a vital seed bank goes awry, Team Scorpion must save Happy, Sylvester and Cabe, who begin suffering from life-threatening, fear-based hallucinations.
Team Scorpion must save a young girl with no immune system who is also a new friend with of Happy's after a storm. Paige and Cabe has to cut people out of their lives.
To stop a dangerous virus from spreading, Team Scorpion must locate a rare endangered monkey in the Amazon that has the antibody for the cure. Also, Toby and Happy see a counselor.
While on a mission to repair a turbine at a wind farm, Team Scorpion must race to save Paige and Happy before the cable holding the gondola they are in snaps and sends them plummeting to the ground.
Tensions run high for members of Team Scorpion when they must overcome personal conflicts to be rescued from the desert island they crashlanded on three weeks earlier.