On October 26, 1985, in the nightmarish alternate timeline where Biff controlled Hill Valley, Emmett Brown sneaked into the closed and boarded-up library, searched through the Hill Valley Telegraph archives and took some bound collections of the newspaper back to his now trashed lab. He discovered that Biff had become a millionaire, while Doc's alternate self had been declared legally insane and committed to the County Asylum on May 2, 1983. He took this information back to Marty McFly, and they were able to stop Biff making use of Grays Sports Almanac in 1955 — thus restoring the timeline.
After Doc rewrote the timeline where a nuclear holocaust occurred in 2045, by preventing much technology from being made commercially available by 2015, the internet was shown to still exist, but it is unclear whether the Hill Valley Public Library was still used to access the internet in this timeline.
Behind the Scenes
- The fourth issue of Back to the Future: Untold Tales and Alternate Timelines told the story of when Doc Brown first visited 2015, before he came back to pick up Marty and Jennifer. Like Doc Brown Saves the World before it, it brings in modern technology that actually exists into 2015. However, unlike the previous story, this story takes place before the events of Back to the Future Part II. Doc Brown accessed Wikipedia on the internet at the library, which seemed to be the only way to access the internet in that timeline.