Marathon ∞ was the third and final game in the Marathon series of science fiction first-person shooter computer games from Bungie Software. The game was released on October 15, 1996 and included more levels than its predecessor Marathon 2. These were larger, scarier, and formed part of a more intricate plot that spanned both space and time. The underlying engine of the game changed little from the one in Marathon 2, and many levels can be played unmodified in both games. The only significant additions were the Jjaro ship texture set, vacuum-enabled humans carrying fusion weapons (called "Vacuum Bobs" or "VacBobs") and a new weapon. Marathon ∞, unlike Marathon 2 was only released for the Apple Macintosh.