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Back to the Future character
Freddie as Einstein
Einstein
Role	Doc's pet & first time traveler
Profession	None
Original time	1985
Time traveler	Yes
Years visited	2015
Appeared in	Part I, Part II, Part III, AS, The Ride
Portrayed by	Freddie
Voiced by	Danny Mann

Einstein (often known as "Einie") is, in the Back to the Future trilogy, Doc Brown's pet sheepdog in 1985, and later to the Brown family. His age is unknown, although he is fully grown and is most likely "middle age" for a dog. This same dog played Einstein in each of the films, and with a greater length of time between the making of the first film and second film. He is the latest of many of Doc's pet dogs named after famous scientists; in this case, Albert Einstein.

Einstein is Doc's constant companion, and despite being involved in many of Doc's experiments, Doc does care about his pet.

Einstein is introduced at the Twin Pines Mall parking lot, where Doc Brown conducts his first time travel experiment. With Doc controlling the De Lorean time machine via remote, Einstein sitting inside it, and Marty filming, Einstein successfully blasts forward in time by one minute, leaving at 1:20am and arriving at 1:21am on October 26, 1985, therefore becoming the first ever time traveller. Einstein, being a dog, is "completely unaware that anything happened" and happily goes back into Doc's truck, unharmed.

Minutes later, Einstein warns Doc that the Libyan terrorists (whom he obtained plutonium to power the time machine from) have arrived at the Mall. As the terrorists murder Doc and chase Marty around the parking lot (until he disappears back to 1955), Einstein stays in the truck, probably scared of the gunfire.

Thus he survives the terrorists and at the end of the movie, after dropping Marty back home, Doc takes Einstein with him into the future. What happens when they are there is partly unknown, but Einstein is left in a suspended animation kennel when Doc heads back to 1985 to pick up Marty (and Jennifer, who happens to be there) to bring them to 2015.

Doc retrieves Einstein from the kennels (this line was in fact written to explain why Doc took Einstein with him to 2015 in Part I, but did not bring him back to 1985 at the end of the film). Einstein stays with Doc and Marty for the remainder of their time in 2015 and tracks down Jennifer, who has been taken to her future home by the police. Doc still has Jennifer's purse, which Einstein uses to get her scent.

Mission accomplished, the four head back to 1985, only to find out it is in fact 1985-A. In this reality Doc-A was sent to a mental institution in 1983-A, and it is unknown what happened to the alternate Einstein. His basket is shown in the remains of Doc-A's lab, so an alternative Einstein did exist at some point in this reality.

Einstein (from the unaltered timeline) is left behind when Doc and Marty head back to 1955 to correct history. When the timeline is reverted back to normal, it changes around Einstein, although he would probably be unaware of this.

In a letter to Marty, Doc asks his friend to give Einstein a good home once he returns to 1985.

At the end of the movie, Doc returns to 1985 with his wife Clara and sons Jules and Verne. They pick up Einstein from Doc's lab, and he becomes the family pet. Although it has been 10 years since Doc saw Einstein, it has only been about 10 hours since Einstein last saw Doc. Einstein is with the family right at the end when they depart in the time machine for times unknown.

Einstein briefly cameos in the videos that play during the wait in line. He shows up apparently working for security at the Institute of Future Technology. He appears to not live up to the duties he is placed in as Biff is able to taunt the time travel volunteers right in front of a camera and remain undetected by Doc.

Einstein was a main character in the animated series. He underwent a bit of a transformation, with the cartoon version not looking that much the film version. Einstein was also a lot smarter and would help Doc with his inventions, due to him being slightly anthropomorphic. The opening credits to Season 1 show that Einstein can drive the steam train time machine by himself.

He usually wore a stopwatch around his neck, as he did in the first film.

• Einstein (Back to the Future) at the Internet Movie Database