The beards arrived on stage first, with three of the grizzly foursome sporting expertly crafted face fuzz with looks that ranged between 'grizzled hunter', 'wizard's apprentice' and 'motorbike mechanic'.
The riffs came next, with the sludge-metal racket and deathly howls of Tread Lightly echoing around the Powerstation's packed walls to the delight of a sold out crowd that included many fans bearing more than a passing resemblance to the band in front of them.
Yes, hipster-friendly metallers Mastodon were well overdue for a return visit after their last appearance here at the 2010 Big Day Out - and if you wanted a dose of balls-to-the-wall metal-tinged swamp-rock, they didn't disappoint.
Since their last appearance here the Atlanta band with three singers have released two new albums, with last year's excellent sixth album Once More 'Round the Sun getting the most attention as they raced through 17 songs in a grizzled 90-minute assault on the senses.