Given his roles in Game of Thrones and Frontier, actor Jason Momoa has won multiple awards over the years but his most challenging effort to date might just be his portrayal of the one and only Ozzy Osbourne.

The Aquaman star recently got in character to portray the Rock legend in the teaser for “Scary Little Green Men.” This new behind-the-scenes clip shows how Momoa channeled his inner Brit for the song, which appears on Osbourne’s recently released Ordinary Man album. He can be heard saying “They’re ve’y rawk’n’rowl, eh?” in an over-the-top Cockney accent as he shows off his newly painted black fingernails.

Going a step further, the rest of the visual shows off props, jewelry, and “a bunch of stuff from the skull store.” Finally, fully-dressed in Ozzy garb, Momoa notes “I know what I’m gonna be for Halloween.” Check out the teaser for “Scary Little Green Men” here.

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Photo: Gage Skidmore