The unsuspecting citizens of Spokane, Washington, wake up one morning to the shocking sight of foreign paratroopers dropping from the sky in a surprise attack on the United States. Soon the entire city is under enemy control, but a group of courageous teenagers has decided to fight back, waging an all-out war against the invaders, to take back their town and their freedom!

The new Director of Homeland Security reunites the team when a nuclear powered Russian satellite is knocked out of orbit and must be diverted before it detonates over Southern California. The team races against time to stop an unstable ex-member of Scorpion, Mark Collins who kidnaps and threatens to kill Toby if his demands are not met.

"Daisy Wilder prefers the company of horses to people, bare feet and salt water to high heels and society parties. Then, in the dizzying aftermath of the attack on Pearl Harbor, Daisy enlists in a top-secret program, replacing male soldiers in a war zone for the first time. Under fear of imminent invasion, the WARDs guide pilots into blacked-out airstrips and track unidentified planes across Pacific skies. But not everyone thinks the women are up...

When Scorpion is on the case, saving the world is a no-brainer! Walter, the eccentric leader of a team of brilliant misfits -- a psychiatrist with a gambling addition, a mechanical prodigy with anger issues, and a "human calculator" with social anxiety, who save the world from problems only a genius could solve.