
Eccentric genius Walter O'Brien leads a group of brilliant misfits who constitute Homeland Security's new think tank, helping defend against the high-tech threats of the computer age. The team -- dubbed Scorpion -- includes behaviorist Toby Curtis, mechanical prodigy Happy Quinn, and statistics guru Sylvester Dodd. While comfortable with one another, the team members struggle with understanding life outside their circle, so when they need help translating societal cues, they rely on the skills of Paige Dineen, a woman with a gifted young son.

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.

On election day, someone tries to create turmoil in the U.S. presidential election, and Team Scorpion is called to investigate.

While in Ireland for Megan's one-year memorial, Walter discovers a natural disaster at a nearby lake has created a poisonous cloud that threatens an entire village; Cabe and Toby try to ease the tension between Tim and Walter.

When the team and Walter's parents visit Megan in the hospital, a deadly fungus outbreak occurs, forcing everyone into quarantine.