Before Halloween, Team Scorpion must infiltrate a deep, vast cave system in order to prevent a bat population from destroying the North America ecosystem. Also, the team dons costumes to stage photos from Halloween’s past for Walter’s upcoming immigration inspection.

Team Scorpion’s job to find sunken treasure goes awry when Walter and Paige’s boat explodes, leaving them lost in the middle of the Pacific Ocean surrounded by sharks.

Team Scorpion must prevent an incoming tsunami from hitting a vulnerable nuclear power facility, and Toby secretly helps his ex-fiancée retrieve her stolen identity.