We’re a little over a month away from the release of the next major Star Wars film, which is technically Episode XIII — The Last Jedi. We don’t know much about the plot, although we have plenty of guesses. One thing we do know is that Mark Hammill will be a bigger part of the story this time, especially after the final scene of The Force Awakens showed Rey handing a much older, weathered, and purposely isolated Luke Skywalker his famous light saber.

In a recent Disney Insider newsletter, Hamill gave a brief interview about returning to the Star Wars franchise that originally made him famous. When asked about Luke’s character looking “darker” than normal, Hamill gave an interesting answer about how Skywalker has changed over the decades.

“In ‘Star Wars: The Force Awakens’, Luke has lost confidence in his ability to make good choices. It haunts him to the core. But he hasn’t gone to the dark side. This isn’t an evil version of him. But it’s still an incarnation of the character I never expected. It has pulled me out of my comfort zone. It’s a real challenge.”

Hamill also adds some context to the key line from the trailers — “It’s time for the Jedi to end.”

“I’m sure this line is a great shock to the audience, so you can imagine how I felt! This is a huge change for a character who once represented optimism and hope. It’s a radical decision to drop out of everything he’s ever believed in. The entire movie is filled with these kinds of jaw-dropping surprises, but you’ll just have to see the film itself to discover what they are.”

You can read the rest of the interview here (it’s short, we promise). The Last Jedi hits theaters on December 15.