Anyone who has seen "Back To The Future" (and who on a science site hasn't?) knows that Michael J. Fox owns the role of Marty McFly but older fans ... or recent devoted ones ... know he was not the first choice.  Instead, they were a few weeks into shooting and Robert Zemeckis felt it wasn't going to be funny enough with his current actor.

Back then, Stoltz was regarded as an up-and-coming, quality actor whereas Fox was a guy on a TV show, so it wasn't without risk to make that change.  But executive producer Steven Spielberg agreed and Zemeckis got the studio to let him reshoot five weeks worth of footage.

For the first time, people who purchase the 25th anniversary DVD will get to see footage of Stoltz as Marty McFly.  Check out some clips below: