Mike Hansen (Nikolai Nikolaeff), Alison "Pi" Renfrey (Cassandra Magrath), Rebecca "Bec" Chan (Frances Wang), Marcello Di Campili (Paul Pantano) and Abraham "Ram" Foley (Damien Bodie) are five
Melbourne high school students who all have a strong interest in computers, online gaming and the internet. While playing an online computer game, they each discover a coded message. The message prompts them to follow a series of clues that eventually leads them to a meeting with Alexandra Davis (Nicki Wendt), president of the software company Catalyst. Confessing that she was the author of the messages, Davis reveals to the teenagers that her company is struggling and she would like to hire one of the teens as
game testers in order to design games for her company at "The Crash Zone". Davis proposes a competition in which the winner takes the job, and while the competition is fierce, she is impressed by their teamwork and offers them all positions in the company. The one exception is Ram, who she feels is too young, but who is allowed to remain with the teens. As well as the developing friendships with each other and their social lives, the teenagers also discover Virgil (Matt Parkinson), a mysterious
artificial intelligence which exists on the internet. The second series has the teenagers returning from their
summer vacations to find the financial situation at Catalyst to have become much more serious. Davis has been forced to lay off most of her staff and they may be next. Two new characters are introduced in the second series, 12-year-old Penny Gallagher and her father Matthew Gallagher. Penny Gallagher, who is befriended by Ram, persuades her father to offer Davis a deal to save
Catalyst from
bankruptcy. Although knowing very little about the video game industry, Matthew Gallagher is a very successful businessman and very quickly turns the company around. However, his changes often results in conflict between him and the staff. ==Characters==