It is pretty widely known that Eric Stoltz, (Caprica) was originally cast as Marty McFly in the ‘Back To The Future’ Trilogy. What a lot of people don’t know is that they actually did 5 weeks of filming before switching to Michael J. Fox.

While the details surrounding the switch have been pretty much secret until now, when the “Back to the Future 25th Anniversary Trilogy” is released on Blu-Ray on Oct. 26 fans will finally gte a chance to hear the tale and even see footage of Stoltz in the role.

Check out the footage below!