Timeline 4 or Timeline C, sometimes called the "Biffhorrific timeline", was an alternate history created when "old" (78) Biff Tannen, from 2015, gave Grays Sports Almanac to his younger self, 18 year old Biff Tannen, on November 12, 1955. Doc Brown, Marty McFly, Jennifer Parker, and Doc's dog Einstein returned from 2015 to a different-looking 1985 than the one they had departed. Doc described the alternate reality as 1985A, and soon discovered that the history of that timeline had started diverging at some point before 1958. Eventually, it was determined (by asking Biff) that the skewing of the timeline had begun on November 12, 1955, and Doc and Marty traveled to that day, arriving a few hours before Old Biff's visit was to begin.