Episode 1 : Satellite of Love
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. Also, Paige and Walter must face their feelings for each other after hospital footage reveals Paige kissed him. Alana De La Garza guest stars as the new head of Homeland Security and KISS frontman Gene Simmons makes a cameo appearance as himself.
Episode 2 : Cuba Libre
Team Scorpion heads to Cuba when a woman from Cabe's past pleads for him to help catch a Serbian war criminal.
Episode 3 : Fish Filet
In order to save the lives of three judges, Sylvester goes undercover in a federal prison but Team Scorpion must break him out when his life is threatened. Kevin Weisman guest stars.
Episode 4 : Robots
Walter, Cabe and Happy are trapped with the crew in a top secret submarine when an explosion sends it to the bottom of the ocean with limited oxygen and a self-destruct function that will soon activate. Peri Gilpin guest stars.
Episode 5 : Super Fun Guys
Team Scorpion goes undercover on the ?Super Fun Guy? movie set in Kazakstan in order to disable a soviet era nuclear missile being sold by terrorists.
Episode 6 : Tech, Drugs, and Rock 'n Roll
Walter's attempt to "normalize" goes horribly wrong when a nefarious virus is uploaded to his computer, turning Team Scorpion's new "smart" building project into a burning death trap with people locked inside.
Episode 7 : Crazy Train
Team Scorpion must stop a sabotaged runaway subway train with Paige and Ralph on board. Also, in his attempt to impress Happy, Toby has his first boxing match.
Episode 8 : Area 51
To help fund Walter's research into saving his sister's life, Team Scorpion takes a lucrative job for the CIA to find a top-secret aircraft in the mysterious Area 51.
Episode 9 : Us vs. Un vs. Uk
Team Scorpion is blackmailed to break into the United Nations to assist in the assassination of a menacing arms dealer. Also, Sylvester makes a bold move to protect Megan's wishes.
Episode 10 : Arrivals and Departures
When Team Scorpion and Walter's parents visit Megan in the hospital as her health deteriorates, they are quarantined after a deadly fungus outbreak threatens to infect everyone.
Episode 11 : The Old College Try
Team Scorpion goes undercover at a university to find a hacker who infiltrates the Federal Reserve and threatens to collapse the world economy.
Episode 12 : Dam Breakthrough
On Christmas Eve, Team Scorpion must prevent a catastrophe when torrential rains create a large crack in a dam, threatening to wipe out an entire town in its wake.
Episode 13 : White Out
In order to save a United States Special Forces unit from certain death, Team Scorpion must brave the subzero temperatures of Antarctica. Also, when Happy becomes cut off from the team and lost in a blizzard, Toby risks his life to find her.
Episode 14 : Sun of a Gun
Sylvester comes face to face with his estranged father, a retired general, who asks Team Scorpion for help when he believes that a dictator in Africa has uncovered a deadly World War II-era weapon of mass destruction and intends to use it.
Episode 15 : Da Bomb
Team Scorpion is tasked with helping NASA's top secret rocket launch, but they must sabotage their own mission when Walter's date from the previous night has a bomb strapped to her chest.
Episode 16 : Fractured
After a powerful earthquake rocks Los Angeles, Team Scorpion must fix a pinched gas line to prevent a massive explosion. Penn Jillette guest stars.
Episode 17 : Adaptation
While Team Scorpion works to stop an influx of drugs being smuggled into the country via drones, Walter gives Happy and Toby an ultimatum on their new relationship. Penn Jillette returns as Toby and Walter's couples counselor.
Episode 18 : The Fast & the Nerdiest
After Sylvester scores big on THE PRICE IS RIGHT, Team Scorpion must infiltrate a high-end car smuggling operation about to ship bioweapons to South America. Host Drew Carey and Announcer George Gray from THE PRICE IS RIGHT guest star as themselves. Eric Roberts and Joely Fisher guest star.
Episode 19 : Ticker
When Los Angeles' blood supply is hacked and deemed unusable because of fear it's been tainted, Team Scorpion must find the culprit in order to save a young girl in desperate need of a heart transplant. Horatio Sanz guest stars.
Episode 20 : Djibouti Call
While on a secret mission in Djibouti, Africa, with his new Homeland protege, Tim Armstrong (Scott Porter), Cabe is captured and Team Scorpion must save him.
Episode 21 : Twist and Shout
Team Scorpion's mission to recover the remains of fallen Marines in Vietnam is threatened along with their lives when a deadly tornado heads directly towards them.
Episode 22 : Hard Knox
Team Scorpion is hired by the Department of Defense to break into Fort Knox and "steal" a precious artifact in order to test their security, but they must break in a second time when they find something dangerous hidden inside the object.
Episode 23 : Chernobyl Intentions
Team Scorpion goes to Chernobyl to repair the decaying nuclear reactor before a catastrophic meltdown, but must also save Sylvester and Paige when they become trapped inside.
Episode 24 : Toby or Not Toby
Team Scorpion must outthink their unstable ex-Scorpion member, Mark Collins (guest star Joshua Leonard), after he kidnaps Toby and threatens to kill him unless his cunning demands are met.