The opening scene of Back to the Future was filled with foreshadowing, and one fan theory recontextualizes Doc's very first time travel experiment.

The day has finally arrived: it’s Back to the Future Day! We’ve been waiting for this day ever since Marty McFly and Doc Brown jumped into their DeLorean and headed off to a place where they ...

While Back to the Future kept Doc Brown's backstory hidden, official comics dive into his past, including his work on the Manhattan Project.