O time Scorpion deve trabalhar com o velho oponente Mark Collins para impedir o fim da humanidade.

O time continua trabalhando com seu antigo oponente, Mark Collins, a fim de impedir um evento massivo de extinção. Cabe toma uma decisão de última hora que pode colocar sua carreira em risco.

O time tenta salvar uma corça grávida e em perigo após esta ter sido alvejada por caçadores ilegais. Happy e Toby discutem o futuro de sua família.

Durante a desativação de um velho míssil nuclear, o time fica exposto a um vapor tóxico. Paige não quer que Happy vá junto com ela e com Walter.

O time Scorpion é feito refém durante uma convenção tecnológica

No Halloween, a equipe Scorpion aceita um caso para comprovar a existência de fantasmas no Queen Mary, mas encontram um desastre bem real ao localizarem um navio fantasma em uma rota de colisão mortal.

A equipe Scorpion conhece Florence, a nova vizinha.

Para o aniversário de Sylvester, a equipe Scorpion visita um festival da renascença, mas a farra é interrompida quando um grupo tenta roubar um depósito de evidências policiais.

No Dia de Ação de Graças, a nova vizinha da equipe Scorpion, Florence (Tina Majorino), se une a eles no mar em uma missão para destruir uma ilha de lixo flutuante.

Enquanto o julgamento de Cabe paira sobre a equipe Scorpion, um caso simples dá errado quando eles ajudam um pai e sua filha cujo avião caiu num local próximo.

As Team Scorpion anxiously awaits the verdict of Cabe’s trial which could send him to prison, they focus their nervous energy on trying to save a dog stuck in a cistern.

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, not Paige.

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 inadvertently crashes a bank robbery in progress and is taken hostage. Also, Sylvester’s feelings for Florence grow.

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.