Most Wanted: Teen Hacker

The FBI descends upon DEF CON in Las Vegas in hopes of uncovering the identity of the highly disruptive hacker known as "Zeekill."

Kivimäki begins falsely reporting emergencies to trigger a law enforcement response, wreaking havoc on an FBI agent and a community in Connecticut.

In 2014, Kivimäki calls in a bomb threat on a passenger plane carrying Sony executive John Smedley, forcing the jet to make an emergency landing. A few months later, Kivimäki shuts down the servers of PlayStation and Xbox on Christmas Day.

After one of the largest healthcare data breaches in history, European officials -- with help from the FBI -- begin to zero in on a familiar suspect.