五个被奇异闪电击中从而获得超能力的少年犯：能隐身的西蒙、长生不死的雷森、倒转光阴的科蒂斯、让人无法按捺巴望的艾丽莎，以及会读心术的凯莉；在前两季中大师都被各自的超能力折腾得够呛。埋没着新身份的西蒙也逐渐成为"反社会五人组"的带领者；在新一季中，他跟艾丽莎的豪情会如何成长下去？他能率领五人组解脱林林总总的麻烦么？
After Alisha's death and Simon's departure to the past, Kelly and Seth travel to Africa, where Kelly uses her knowledge of mechanical systems to defuse land mines, and end up staying. Curtis and Rudy continue with community service joined by Finn, an anxious telekinetic, and Jess, a snarky, reserved girl with x-ray vision. Major subplots include Rudy and Finn moving into the community centre together, Finn's one-sided infatuation with Jess, Curtis's encounters with Lola, a mysterious woman who claims to be a trainee probation worker, Finn's search for his father, and Jess's relationship with Alex, "From the Bar", a mysterious bartender who spends most of his time looking for his penis, lost as a result of a mysterious power. As a result of his encounters with Lola, Curtis ends up using his resurrection power again, leading to his own infection. In order to stop his increasing thirst for blood, Curtis commits suicide, emotionally affecting Rudy as a result.
After Curtis's suicide, the gang encounters Abbey, a girl who suffers from amnesia as a result of the storm who later joins the group on community service, and Nadine, a nun with a mysterious secret whom Rudy falls in love with. Alex finds and retrieves his penis, but his regained sense of masculinity causes him to cheat on Jess, angering Finn. Nadine's power is eventually revealed to be the ability to inadvertently summon the Four Horsemen of the Apocalypse when surrounded by anger or violence, which she does after witnessing Alex and Finn arguing over Jess. The Horsemen attack the gang and stab Alex when he steps in to protect Jess. Nadine sacrifices herself in order to stop the Horsemen from wreaking more havoc, leaving Rudy heartbroken once more. As a result of the Horsemen's attack, Alex is rushed to the hospital to receive an emergency lung transplant.
