Mark Hamill's surprise appearance as Luke Skywalker in The Mandalorian stands as one of the most thrilling moments in Star Wars history. At Star Wars Celebration, Rosario Dawson shared with us the astonishing twist she experienced on the set of The Book of Boba Fett—she was completely unaware of Hamill's cameo until he actually walked onto the set.

It's no secret that Dave Filoni and Jon Favreau went to great lengths to keep Luke's cameo under wraps. They cleverly used Jedi Master Plo Koon as a decoy in the scripts to mislead potential leakers. However, this ruse inadvertently led to one of the biggest surprises in Dawson's career because she was not informed of the true plan.

Concept art of Plo Koon used to mislead leaks. Image Credit: Disney & Lucasfilm

To safeguard the monumental secret, scripts that mentioned Luke Skywalker instead referred to Plo Koon, and Dawson was equally caught off guard by this substitution. She recalled her confusion upon reading about Plo Koon's supposed arrival in The Book of Boba Fett, especially since fans know the Jedi Master met a tragic end in Revenge of the Sith.

"I was like... I don't know... but people disappear and then they come back, so maybe it's possible?" Dawson mused. Her bewilderment turned to astonishment when Mark Hamill appeared on set. "He even said, 'Plo Koon? That wouldn't even make sense!' and I'm like, 'I know it didn't make sense, but I still had to think it made sense because I got the script and everything!'"

Filoni and Favreau expressed their regret over the oversight, with Filoni admitting, "That was bad on us!" and adding with a laugh, "We assumed you'd gotten told the right information. We were in it so much."

Favreau elaborated on the intense secrecy surrounding the show, saying, "There were two secrets we knew we had to keep on the show. One was Grogu's reveal at the end of the first episode, and the other one was Luke Skywalker at the end of season two. We were biting our nails all the way through, and we somehow miraculously made it cleanly to both of those because everything else leaked. But, unfortunately, we didn't fill in our partner here."

Dawson took the surprise in stride, humorously noting, "I love it, they know I can't be trusted."