While some parts of the story are stretched to make it more enjoyable, we are determined not to stray too far from the original story-line. When past Biff uses the almanac to become wealthy and buy up all the land in Hill Valley, Doc Brown is forced to invent his 'Time Travel Chamber' out of an old Sears Coldspot refrigerator to stop Biff after a series of murders. However, without the energy created by the DeLorean to produce enough power for a full jump in the timestream, the Chamber can only send one person back for four hours, and Doc Brown and his allies fail to change the timeline, resulting in that timeline's Brown being committed before the mainstream Doc and Marty fixed the timeline. Back to the Future: Liberty City will be based on the Back to the Future Trilogy, allowing the player to re-enact all the great moments from the films. Of course, that wasn't the only time-travel device made by Doc Brown, as revealed in IDW Publishing's Back To The Future: Biff To The Future. The comic series from BTTF co-creator Bob Gale, Derek Fridolfs, and Alan Robinson explored the alternate timeline created in Back To The Future II when future Biff Tannen delivers a Grays Sports Almanac to his past self, changing the future. Download Free Back to the future PNG Images, Back To The Future Part Iii, Back To The Roots Water Garden, Back To The Roots, Back To The Future Part Ii.