Christmas Day wasnt entirely celebratory for the developers at Bungie and Halo Studios, as a massive data leak unleashed 90 GB of confidential Halo data onto the internet. One of Xboxs flagship franchises, the Halo series first launched in November 2001 with Bungie-developed Halo: Combat Evolved. The first-person shooter was groundbreaking and fun, a combination that led to commercial success and a firm place in video game history.