This is a graphic novel, created by Bob Gale, John Barber, Erik Burnham. Gale co-wrote the Back to the Future movie (and the two sequels) with director Robert Zemeckis, and he also produced the movies. Barber is a webcomic writer and artist with whom I am not familiar. Erik Burnham is a writer who's been associated with Ghostbusters and TMNT comic book, including this one that I favorably reviewed back in February 2015, even though I am not a TMNT fan.
This collaboration worked well. The book is filled with issues one through five of the individual comics, offering a handful of short stories linked by a narration from Doc as he modifies the steam engine which he will convert into another time-travel machine. We get to see how Marty and Doc first met, how Doc became involved in the Manhattan Project, how Marty had to deal with yet another school bully in his own school when he was younger, how his parents came very close to breaking up after Marty had gone back to the future, and so on.
The dialog is just like the movie, and Doc Brown and Marty come off exactly like they did in the movie. The artwork is excellent and very colorful. The stories are entertaining, funny and well done, and the overall graphic novel is wonderful. I recommend this one.