Season Four is the fourth and final season of Scorpion, and was confirmed on March 23, 2017. it premiered on September 25, 2017 and the series finale air on April 16, 2018
At Halloween, Team Scorpion takes on a case to prove the existence of ghosts on the Queen Mary but find an all-too-real disaster when they locate a "ghost ship" on a deadly collision course.
A device that can prevent a nuclear meltdown is lost in the LA sewers and it is up to team Scorpion to find it while dealing with a new tenant next door.
Team Scorpion must work with Toby’s nemesis, Quincy Berkstead, and his wife, Amy, Toby’s ex-fiancée, when they are locked inside an artificially intelligent doomsday bunker that aims to kill them. Also, Walter is distracted by his recent dream where he is married to Florence.
A solar storm knocks out power in Los Angeles, and Team Scorpion must help a teen pilot and his girlfriend who are lost over the Pacific without navigation or radio contact. Also, during the crisis, Walter must look after a group of Ralph’s classmates, and Cabe tries to tell Allie finally that he loves her.
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.
On Valentine’s Day, Team Scorpion must set aside their romantic plans to help a doctor and pilot trapped inside a helicopter that crashed atop a skyscraper. Also, Toby and Happy wait for news on their fertility results, and Sylvester realizes that he may have feelings for Florence.
The geniuses of Team Scorpion turn into knuckleheads and Paige must simplify the science for them, when their mental faculties are impaired during a job to prevent the creation of a black hole. Also, Florence and Sylvester grow closer when she helps him with a special project.
Team Scorpion heads to the bayou to track down a cagey alligator in order to stop a deadly mosquito-borne virus, and Paige teaches Walter the concept of the “white lie.” Also, Walter hits Cabe with a tranquilizer gun and Toby must save his life, and Sylvester and Ralph help Patty when the mean girls at her school force her to get a dreaded tardy slip.
Team Scorpion must use their high IQs to win a softball game when the homeland director challenges, with all of their future government contracts on the line. Also, Walter’s secret night out with Florence puts Toby and Happy on edge.
Paige’s maternal side goes into high gear when Team Scorpion must save an unconscious, hypothermic boy stuck in the wheel well of their airborne airplane. Also, Walter’s white lie to Paige starts to take a toll on him, and Paige realizes something’s up.
Team Scorpion heads to Northeast Africa where they must carefully navigate a minefield in order to save the lives of local villagers. Also, Paige and Walter’s relationship takes a shocking turn, and Toby and Happy make an important decision.
