Black Sabbath fans shocked as Game of Thrones legend Jason Momoa joins moshing crowd at final gig

The one and only Jason Momoa was spotted moshing at an all-day Black Sabbath gig this weekend.

In town to compère the heavy metal festival - known as 'Back to the Beginning' - which marked the final time Ozzy Osbourne, Tony Iommi, Bill Ward and Geezer Butler would rip up the stage together, the Game of Thrones star jumped into the Villa Park crowd when special guests Pantera took up their instruments for a four-song set.

This featured covers of Sabbath tunes 'Planet Caravan' and 'Electric Funeral', plus two of their own tunes 'Cowboys from Hell' and 'Walk'.

In a video shared across social media, a black-vested Momoa can be seen climbing over the barricade and wading into the front of the standing section where he incited a giant circle pit.

"Jason Momoa a real metalhead! Walked into the center of the pit to mosh with the crowd," read ones of the many captions of the circulating clip.

One 'Back to the Beginning' attendee seemingly didn't even release the A-lister was there on the day, commenting: "Are you telling me I was breathing the same oxygen as JASON MOMOA?????"

"He just wanted to have a moment as a regular fan... good for him!" and "He just wants to live his best metal life," read another couple of online reactions.

All the proceeds from the day went to Cure Parkinson's charity, Birmingham Children's Hospital and Acorn Children's Hospice.

Other bands preceding Ozzy and Black Sabbath included Metallica, Slayer, and Guns N' Roses, Gojira, Alice in Chains, Halestorm, Lamb of God, Anthrax, and Mastodon, plus The Smashing Pumpkins' Billy Corgan and Limp Bizkit's Fred Durst.

Previously opening up on his 'Back to the Beginning' recruitment, Aquaman and Dune star Momoa told Kerrang that he'd originally just been pestering metalheads for tickets to the show, until Ozzy's wife Sharon Osbourne heard about his interest and came out with an unmissable invitation.

"I was just calling my buddies. I called Scott Ian, I called Kirk [Hammett], I called people basically begging to go," he shared.

"And then Ross Halfin, who’s the photographer of every goddamn band, he hit me up and [asked if I was going to be there]. I said I was trying to get a ticket, then he's like, 'Sharon wants you to host it!' I’m like, ‘What the f**k are you talking about, man?!’

"I'm over here begging for a ticket and now they want me to host it! I've never hosted anything before but I've gotta go out in front of all these f**king people and host! And now it's on pay-per-view. Jesus Christ.

"This show is going to be amazing and I'm so happy they've done it on pay-per-view for all to see. Ozzy is everything to me. Sabbath is every-f**king-thing, man."

Further waxing lyrical, he continued: "I remember the first song, I remember playing Sabbath to my kids the first time. I love everything about that band. They're real man, and I'm just going to be around everyone that I grew up loving."