the first film and Freddie in the other two, voiced by Danny Mann in the animated series) is Doc Brown's pet Catalan sheepdog. He later becomes one of the main characters in the animated series as the Brown family's dog. In the first film, Doc successfully tests his time machine by placing Einstein in it and sending him one minute into the future. In the animated series, Einstein becomes anthropomorphic and smarter, helping Doc with his inventions for traveling to the past and the future. Tannen family Irving "Kid" Tannen Kid Tannen (voiced by Owen Thomas) is Biff's father who only appears in the Back to the Future: The Game. Kid is a gangster who runs a local speakeasy in the 1930s Hill Valley. He, like the rest of the Tannen family, bullies the McFly family forcing Marty's grandfather Arthur to do his accounting. Kid is brought down with the help of Marty, a young version of Doc, and Arthur McFly. He later marries Edna Strickland and reforms from his criminal ways with her help. Buford "Mad Dog" Tannen Buford Tannen (portrayed by Thomas F. Wilson in Back to the Future Part III, Liam O'Brien in Lego Dimensions) is the main antagonist of the third film. He is the great-grandfather of Biff Tannen and the local town outlaw in 1885 Hill Valley. He was nicknamed "Mad Dog" by a newspaper reporter, due to his violent temper and propensity for drooling, a nickname Tannen greatly despises. Buford is cruel, homicidal, rude, and emotionally unstable. He displays a need for control and is brought down to childlike tantrums when he is humiliated or makes mistakes, whether it be something that happens to him or something he says or does. He is often accompanied by his gang (played by Christopher Wynne, Sean Sullivan and Mike Watson), and developed a feud with Marshal James Strickland and his deputies. Like his descendant Biff, he has a dislike for manure. Griff Tannen Griff Tannen (portrayed by Thomas F. Wilson in both Back to the Future Part II and in the animated series) is a grandson of Biff. He is part of a gang that also consists of Rafe "Data" Unger, Leslie "Spike" O'Malley and Chester "Whitey" Noguera. Unlike his grandfather and great-great-great-grandfather whose gangs only consisted of Caucasian males, his accomplices are one Caucasian male (Data), one Caucasian female (Spike), and one Asian-American male (Whitey). In