Terminator Genisys might not have been the most popular movie of 2015, but it did include a memorable fight scene where the old and young versions of Schwarzenegger's T-800 have an epic street brawl. But how was Arnold able to fight himself? Cutting edge CG, obviously.
The Moving Picture Company was one of the many visual effects studios to work on the film and it handled the scenes where Arnold goes toe-to-toe with the younger version of himself. Because face scanning technologies didn't exist back in 1984, it wasn't as easy as just digging up old digital models of the actor. But working with old photos and footage, they were able to convincingly bring the character back to life.