Action Man: A.T.O.M.

After competing in and completing the reality show, Trackdown, the five contestants, Axel, Hawk, King, Lioness and Shark are offered jobs to test new and experimental vehicles for Mr Lee, Trackdown’s creator and president and founder of Lee Industries, a multi-billion dollar company. The five accept his offer, but when a dangerous criminal mastermind named Paine escapes from prison, Axel has personal interest into helping recapture him.

Lee, who is acting clingy and parental around the team, equips them with new gear and weaponry to test. At the same time Paine and his henchman Spydah seek to destroy the Landmark City dam. Axel also tells Lioness about his past with Paine.

The Alpha Teens move out of Lee’s R & D physicality and into an abandoned Aquatic Center. Meanwhile, due to a freak accident caused by Axel previously, Paine gains new powers that emit terrible pain through his body which he can transfer to those he touch. With these powers, Spydah and added help from the acrobatic Cannonball Bros., Paine goes to Lee Industries, seeking revenge on Axel Manning.

Paine learns of Nutronium, a chemical that can put an end to his constant pain. He and Spydah seek to steal it with the help of Albert, a dangerous muscle-laden criminal who uses a barbell for a weapon. In the heat of battle with the Alpha Teens, Paine unintentionally mutates Albert into the super-strong giant, Flesh.

The Alpha Teens, Lee and the building security board head of Landmark City become trapped in the yet to be opened Lee Plaza. The culprit, Silas Greene the building’s deranged architect, seeks revenge against Lee using the building’s security robots and other lethal functions to dispose of him.

The Alpha Teens accompany Hawk, who stars in the movie being filmed, "Radioactive Island", to an island that served as a military testing site. While King’s animalistic nature steals Hawk’s thunder, it also gets the attention of Recombo, a mad scientist who combines different species of animals into one.

After Paine, Spydah and Flesh are arrested, Lee fires the Alpha Teens, strips them all of access to their vehicles and their credit line. As the five are forced to get normal jobs, Axel is attacked by Lee’s creature.

Lee reveals to Axel that his creature, Tilian is Axel’s mutated clone. He tells Axel his true intentions which gets him stripped of all his power at Lee Industries. Lee experiments on himself so he could be super-intelligent and super-strong, but the Alpha Teens stop this and Lee becomes completely evil. Lee hints to a Mu-Team and that Tilian isn't his only clone. Also still finding work, Shark and Hawk compete as ice cream men.

With the Aquatic Center totaled by Paine, Spydah and Tilian collectively, and still trying to find paying jobs, the Alpha Teens make a rundown apartment their new home. Garrett, though may has a solution for their problem. Meanwhile, Lee sends mutant clones of Lioness and King, Firekat and Wrecka respectively to destroy the team.

Shark lands a job as a lifeguard where he meets a beautiful scientist named Rachel. Unfortunately Mr. Lee has Rayza, Shark’s mutant clone, kidnap Rachel. Hawk is taught the basics of swimming as he and the other members of the Alpha Teens are attacked by his clone, Stingfly.

Lioness is asked to give a public speech at a fundraiser, bringing to the surface old fears. Lee lures Axel into a trap and sends the Mu-Team, including a thought-to-be-dead Tilian, to ambush him.

Needing a bit of extra intelligence to correct a design flaw (with Hard Light), Mr. Lee takes over the advanced school where King's brother, Duke, attends. The process in which Lee uses to siphon all the students' intelligence into Duke turns him evil and gives him telekinesis.