Warning: the following contains SPOILERS for The Mandalorian and The Book of Boba Fett.
Star Wars has revealed just how Mark Hamill looks as Luke Skywalker in The Mandalorian season 2 finale without CGI, as well as the deep fake process considered to bring him back and how they ultimately de-aged him. Luke Skywalker's return in The Mandalorian was one of the biggest Star Wars moments since Disney purchased Lucasfilm, with the Jedi arriving to take Grogu away for training. It was made even more impressive by the fact that Luke skywalker's Mandalorian deep fake was somehow kept a secret, even despite Hamill himself returning to the role.
Of course, Hamill is now in his 60s, so couldn't just play Luke post-Return of the Jedi. Instead, The Mandalorian used de-aging technology and a stand-in actor, Max Lloyd-Jones, in order to bring Luke back. The end result was somewhat divisive in terms of the visual effects, with some fans complaining of the Uncanny Valley appearance of Luke. but in terms of the story Luke coming for Grogu worked perfectly. Luke Skywalker's Mandalorian deep fake also set the stage for the Jedi's return in The Book of Boba Fett.
Related: Grogu's Future Can Repeat Star Wars' Rey Skywalker Trick (But Better)
The Mandalorian's deaged Mark Hamill is a combination of old pictures and footage with cutting-edge digital technology. Disney Gallery: Star Wars: The Mandalorian season 2, episode 2, «Making of S2 Finale,» goes behind the scenes of Luke's return. The special documentary is all about what it took to bring both Luke and Hamill back. As such, it has a few reveals as to the process of digitally re-creating this character. That means getting to see Hamill himself standing uncloaked in The Mandalorian, rather
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