On Back to the Future Day (that's October 21, 2015), a film short premiered at Universal CityWalk in Hollywood that imagined Marty McFly arriving to the future — meaning, October 21, 2015. Back to the 2015 Future reunited several original cast members (but used a Michael J. Fox impersonator) and, in the four years it's been online, has garnered over 3 million views.
Now, YouTuber Pacto Copernico has made a deepfake version of the 15-minute short where Michael J. Fox's face is put on the impersonator's, Tyler Dunivan. There's still a decent amount of uncanny valley but, if you squint, you might be able to suspend your disbelief a little to enjoy this "sequel."
Hurry, Watch all three before they get shut down:
Back to the 2015 Future (not deepfaked):