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In the 'Scary Little Green Men' teaser, released yesterday (February 20), a tall figure donning a black cloak and heavy jewellery walks slowly towards a microphone.
While many assumed it was the former Black Sabbath frontman, the hood gets pulled back to reveal Momoa in all of his long-haired glory.
And he takes to the role like an Aquaman to water, mouthing Ozzy's lyrics and headbanging all over the place.
In the grand finale, Momoa goes to bite the head off a (fake) bat, replicating one of the most infamous moments in the 71-year-old's legacy.
The teaser clip dropped ahead of the upcoming full music video, arriving alongside the release of Ozzy's new album Ordinary Man.
It's quite the feat, not just because of the singer's age, but also due to his deteriorating health condition.
Against the odds, Ozzy's managed to record and release a full album despite suffering from Parkinson's disease.
In an emotional interview with Good Morning America last month, Ozzy sat alongside his wife Sharon to explain the situation - and while they said it's 'not a death sentence', the condition has taken its toll on the singer and he was forced to cancel an upcoming tour to receive treatment.
The rock icon said the issue all started when he went to have surgery following a fall last year and began to experience nerve pain.
He said: "Well, it has been terribly challenging for us all. I did my last show on New Year's Eve."
I had a bad fall and had to have surgery on my neck which screwed all my nerves in. And I found out I have a mild form..."
Interjecting, 67-year-old Sharon explained: "Parkin 2 which is a form of Parkinson's and it is - there's so many different types of Parkinson's - it's not a death sentence by any stretch of the imagination but it does affect certain nerves in your body.
"It's like you have a good day, a good day and then a really bad day."
Speaking of his fans, Ozzy said: "I feel better now I've owned up to the fact that I have a case of Parkinson's. I just hope they hang out and are there for me because I need them...
"I just can't wait to get well and I'll see you on the road again. That's what's killing me. I need it you know, that's my drug today.
"Done all the other crap - left that by the wayside, survived that and I ain't done yet and I ain't gonna go anywhere yet."
And he's certainly proved that with the release of a new album - there aren't many rock stars from that era who have been through it and made it to the other side.
Guess you can't keep a bad prince down - especially when people like Jason Momoa have your back.
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