Former Metallica bassist Jason Newsted performed the classic Metallica song "Phantom Lord" with Megadeth last night (Sunday, August 11) at the final show of this summer's Gigantour in Toronto, Ontario, Canada. Check out fan-filmed video footage of his appearance below.

Newsted, who quit Metallica in February 2001, is the frontman of a new band, called Newsted, which took part in this year's edition of Gigantour, the critically acclaimed package festival founded in 2005 by Dave Mustaine.

Speaking to Artisan News at the August 6 Newsted signing session at Looney Tunes in West Babylon, New York, Jason stated about how the idea for the jam came about: "It was mostly created by kind of rumor and agents and managers and things like that early on when we were putting together the structure of this tour, that 'maybe you and Jay can play a song.' It was never something that I said or that Dave said, it was [something] that managers said to us."

He continued: "I'm open to jam with anybody whenever anybody wants to jam — I think that's not really a secret or nothing — so if the dude calls out 'Phantom Lord', I'll sing or play bass guitar or whatever he wants; that's all fine.

"As a fan, jamming with Dave, coming from back here ... 'Cause I was a fan of Dave before we were brothers and peers and stuff like that. So, man, if he wants to jam, I'm open to that, of course."

Mustaine previously hinted that he would invite Newsted up on stage to perform a song Dave wrote during his time with Metallica.

Addressing his followers on Twitter, Mustaine wrote: "If I play a song I wrote in @Metallica w/@JasonCNewsted, which should it be? Ride, Metal Militia, Phantom, Jump, Khutulu, or Four Horsemen?"

Mustaine, who was one of the original members of Metallica, left the band in 1983 and went on to form Megadeth, achieving worldwide success on his own.

Jason Newsted Tweet:

Jason Newsted Facebook:

"Sunday, August 11, 2013 in Toronto at the Molson Amphitheatre was the last date on Gigantour…a show that will go down in thrash metal history. For the first time ever, Megadeth performed a Mustaine-penned, Kill ‘Em All era track…and I sang lead vocal!!!! An amazing dream come true for this metal kid & a great moment for all those grateful fans fortunate enough to have experienced it live!! What a fantastic way to finish off a victorious tour with our long time metal brothers!! Much thanks to the Megadeth camp & all the other bands, their crews & loyal Fans that helped make this a great summer!! Cheers."