The members of Team Scorpion must pass a mandated psych evaluation or face being disbanded after they're accused of destroying a priceless work of art in an attempt to protect an art exhibit. Paige enlists the help of the team when Ralph is reluctant to go to his school's Halloween party.

The members of Team Scorpion brave subzero temperatures in Antarctica to save a United States Special Forces unit. Toby risks his life to save Happy.

The team members set aside their personal and romantic issues when hackers take over targeted U.S. military aircraft and war ships, pointing the weaponry at American cities.

When Team Scorpion travels to Ireland for Megan’s one-year memorial, Walter discovers that a nearby lake’s natural disaster has created a poisonous cloud that could kill everyone in the village. Also, Cabe and Toby try to alleviate the tension between Tim and Walter.

Team Scorpion gets trapped inside a failing and dangerous biodome designed for Mars while trying to extract a pair of scientists inside.