The governor calls on Team Scorpion when his daughter is mysteriously "bio-hacked" with a deadly virus and only has 24 hours to live. The case takes on a deeper significance for Walter after he receives a letter regarding his sister.

After failing a military training mission, the team members are determined to prove themselves when an Internet infrastructure is threatened by a bomber.

Against Cabe's advice, Team Scorpion heads to Las Vegas for a simple casino job, but a robbery leads to Walter's arrest and the rest of the team is left to clear his name.

To fix a Los Angeles nuclear reactor that's on the verge of a cataclysmic meltdown, Walter and the team must reluctantly enlist the help of a troubled former member.

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.

A case gets personal for Team Scorpion when three convicts break out of prison and one of them is a brilliant hacker who was forced to help the others steal billions online. Meanwhile, Paige must manage Ralph's expectations when his father returns.

Team Scorpion enlists the help of a musician who created a controversial algorithm that generates hit songs to help find the murderer of a music blogger. Meanwhile, Drew asks Walter to help him connect with his son.

Team Scorpion try to protect Cabe's ex-wife, after she uncovers evidence that suggests foul play in the death of a prominent congressman.

When a military plane is shot down in Bosnia, Team Scorpion must help recover its stealth technology before it falls into enemy hands. Meanwhile, Walter's sister takes a break from her MS treatment and spends time at the garage with Sylvester