In December, Metallica celebrated their 30th year as a band with four very special shows in San Francisco. The fourth and final show led to some truly incredible events, including former Metallica members Dave Mustaine and Jason Newsted joining the band onstage.

With some of metal's finest musicians such as Rob Halford and King Diamond having already jammed with Metallica during the first three shows, expectations for the final show reached a level of gargantuan proportions. The legendary thrashers needed to deliver more than just a rocking musical evening with fans swaying to Metallica's beat, and the band arguably succeeded beyond the now legendary 'Big 4' shows.

Ozzy Osbourne and Geezer Butler from metal's most highly-acclaimed band, Black Sabbath, joined Metallica for covers of 'Sabbra Cadabra,' 'Paranoid' and the almighty 'Iron Man.'

As if that wasn't unbelievable enough, two of the most highly publicized feuds in metal showed signs of being buried forever as Megadeth frontman Dave Mustaine and former Metallica bassist Jason Newstead stood side-by-side, axes in hand for a slew of Metallica songs.

Mustaine would later express the personal happiness the show brought him. “Me and James, we were like the the Toxic Twins back when we played together and we were a very very dangerous duo,” raved Mustaine. “I know I was having fun. I had a smile that I went to bed with.”

Metallica have posted a 45-minute recap of the final show and it is an absolutely, 100% must see for any metalhead. Check it out below:

Watch Metallica's Final 30th Anniversary Show