The Star Wars saga is filled with hidden cameos, and while the practice really kicked off in the Prequels; the Sequel Trilogy is filled with celebrities hiding out under Stormtrooper helmets. It started with people like Daniel Craig and Simon Pegg in The Force Awakens and continued through The Rise of Skywalker.
Now Karl Urban has revealed to Digital Spy that he played a Stormtrooper in the final movie of the Skywalker Saga and can be seen when the Knights of Ren arrive with Kylo right after his helmet is repaired:
“What is in the cut is my voice saying ‘Knights of Ren’ as Kylo Ren walks down a hallway past two stormtroopers. I am one of those stormtroopers,” he said.
The other Stormtrooper, who calls the Knights of Ren “Ghouls”, is not identified.