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Watch: Mark Hamill from 'Star Wars' pranks fans for a good cause
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Mark Hamill went undercover as a stormtrooper, walking Hollywood Blvd. to raise awareness for the Omaze charity campaign, Force For Change, with these hilarious interactions. - photo by Payton Davis
The last time "Star Wars" actor Mark Hamill wore Stormtrooper attire, Luke Skywalker busted Princess Leia out of a cell block in the 1977 film, according to the Daily Mail.

Now it's for another good cause, Ross McDonagh wrote for the Mail.

Hamill took to Hollywood Blvd. disguised as a Stormtrooper, encouraging passersby to donate to the Omaze charity fundraising campaign, Force for Change. Kelly Lawler wrote for USA Today that the grand prize includes attending the "Force Awakens" premiere and meeting the cast.

"Too bad most of the people he talks to in the video didn't realize they were meeting Luke Skywalker himself then and there," Lawler wrote.

Throughout the video, Hamill encounters others dressed as "Star Wars" characters and has a stand-off with Darth Vader. He also asks fans about their favorites from the films and discusses the benefits of donating to the campaign.

"Just donate $10. You don't want to be a bad guy, do you?" Hamill asks Vader.

The Mail noted Vader's response in a "not very Sith-like high pitched voice."

"OK, that sounds like a very worthy cause," Vader tells Hamill.

According to Relevant magazine, proceeds given to the Force for Change campaign go to 15 charities, including Make-A-Wish, Special Olympics and (RED).