This is really cool. And, hey, Rogue One: A Star Wars Story has been out for two months, so we're gonna unapologetically give a couple of spoilers! Sue us!
The events of Rogue One take place only moments before the classic, 1977 Star Wars (Episode IV: A New Hope). As a result, there was an opportunity to bring back one of the original villains, Grand Moff Tarkin.
There was only one problem. The actor who portrayed Tarkin, Peter Cushing, was dead. But thank God for computers! Check out this awesome video of how the creators of Rogue One brought Tarkin/Cushing back to life!
- East Side Dave