After their jaw-dropping alternative history of 20th century Soviet-American relations for Mettalica's nine-minute epic All Nightmare Long, now Roboshobo have created something equally ambitious and entertainingly far-fetched for the well-heavy Mastadon.

This is what happens when a band go mountaineering and find evidence of prehistoric human sacrifice and the existence of mythical man-beasts. And then shoot bolts from their instruments to thaw out a superbad cave-dude...

You've got yourself a whole heap of big trouble, that's what...

Watch 'Mastodon’s Divinations by Roboshobo' here