Joe Engressia (known as Joybubbles) accidentally discovered it at the age of 7 by whistling (with his mouth).
John Draper, Steve Wozniak and Kevin Mitnick are prominently featured while the film additionally features comments from or else archive footage concerning Denny Teresi, Joybubbles, Mike Gorman, Ron Rosenbaum, Steven Levy, Paul Loser, Lee Felsenstein, Jim Warren, John Markoff, Jay Foster, FBI Special Agent Ken McGuire, Jonathan Littman, Michael Strickland and others.
The main character from the series, Kevin, is a composite of many well known phreaks and hackers such as Kevin Mitnick, Kevin Poulsen, Joybubbles, and many others.