'Star Wars' legend Mark Hamill reacts to the 'unexpected' cameo on 'The Mandalorian' season finale

• Warning: Spoilers for the season two finale of "The Mandalorian."
• Mark Hamill appreciated a surprise cameo at the end of season two's "The Mandalorian."
• "Sometimes the greatest gifts are the most unexpected and something you never realized you wanted until it was given," Hamill wrote.

Mark Hamill is as amazed as the rest of us about the cameo of his legendary "Star Wars" character Luke Skywalker in the season two finale of "The Mandalorian."

Two weeks after the finale aired - featuring a de-aged Skywalker (which Hamill voice for the episode) cutting through stormtroopers and Dark Troopers to rescue Mando and Grogu - the actor took to Instagram to show his appreciation for the appearance.

"Sometimes the greatest gifts are the most unexpected and something you never realized you wanted until it was given," Hamill wrote with a picture of a hooded Skywalker from the episode's end.

He finished the post by writing "#ThankYouJonAndDave," referring to show creator Jon Favreau and executive producer Dave Filoni.

Skywalker's appearance has found huge acclaim in the "Star Wars" fanbase, but Favreau has admitted that it was strenuous to keep the cameo a secret.

"It was very tricky because it's very hard to keep a secret nowadays, especially with 'Star Wars,' because people are so curious about it and there are so many people involved with the process," he told "Good Morning America" the Monday after the episode aired.

"Every piece of casting leaked," Favreau continued. "We were so scared right up 'til it aired that our surprise cameo was gonna leak, too."

The actor who doubled as Hamill in the scene that featured the de-aged Skywalker was Max Lloyd-Jones, and along with voicing the character, Hamill was also on the set supervising the cameo, according to Favreau.

There was also praise for the music accompanying the Skywalker cameo. "The Mandalorian" composer Ludwig Göransson explained to Insider how he created the score for the sequence, which he knew would be memorable.

"I basically wrote a new theme for Luke there because I wanted the reveal to be a surprise, I didn't want to hint at anything," he said. "When you see him show up in the X-Wing, there's electric guitar and a children's choir playing. It kind of sets the tone. Then by the end, it's a nice transition from heroic mystery theme into the Force theme."

When the hooded Jedi is revealed to be Skywalker, the score moves to the familiar horns of the John Williams-created Skywalker theme.

"When Luke takes his hood off we all wanted people at home to stand up on their feet and feel this power," Göransson said.

All episodes of "The Mandalorian" are available on Disney Plus.