OK, I've been reading up on this because I cannot wait for Sunday, and I've compiled a list of the confirmed voice talent so far:
James Hetfield (Metallica)
Kirk Hammett (Metallica)
Michael Ammott (Arch Enemy)
Warrell Dane (Nevermore)
Jeff Loomis (Nevermore)
Steve Smyth (Nevermore)
And apparently Brendon Small has spoken to KING MOTHERFUCKING DIAMOND over the phone and was 'hoping to record him in June'. And Mark Hamill is in it too!
THIS SETTLES IT. THIS IS GOING TO BE THE BEST THING TELEVISION HAS SEEN, EVER. EVER EVER EVER.
Seriously, King Diamond and Luke Skywalker. I am totally spazzing out here.