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Old 11-07-2010, 02:40 PM
Martin Hyde is offline
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Join Date: Mar 2004
Posts: 14,229
It happens like this:

Old Biff in the original future timeline sees Doc Brown and Marty McFly, and he sees they have a time machine. He also sees Marty throw away that sports almanac. While Doc Brown and Marty are busy in the original future Old Biff steals the time machine, taking the sports almanac with him. He goes back to the original 1955 and gives young Biff the almanac.

Meanwhile, Doc Brown and Marty are under the impression they set things right in the future and go back to 1985, only to discover that they're in a new 1985 timeline in which Biff has become all powerful.