Carrie Fisher’s untimely passing left a void that needed to be filled in “Star Wars: The Rise of Skywalker”.

“Star Wars: The Rise of Skywalker” features about eight minutes of unused footage from “The Force Awakens” and “The Last Jedi”. There was one scene in particular, however, that required a little extra finessing from director J.J. Abrams.

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Warning, the following will spoil a brief moment in “The Rise of Skywalker”. Continue at your own peril.

Luke Skywalker teaches his sister, Princess Leia, how to use lightsabers in a flashback. It turns out, Leia was studying to become a Jedi. Abrams confirmed that Mark Hamill was digitally de-aged for the scene, but Fisher’s daughter Billie Lourd filled in as Leia.

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“Billie was playing her mother,”  Industrial Light & Magic visual effects supervisor Patrick Tubach told Yahoo. “It was a poignant thing, and something that nobody took lightly — that she was willing to stand in for her mom.”

“It felt great for us, too,” he said. “If you’re going to have someone play [Fisher’s] part, it’s great that it’s [Billie] because there are a lot of similarities between them that we were able to draw from. The real challenge was just making the Leia footage we had to work with fit in that scene.”