Currently available on 4 streaming services.

Streaming, rent, or buy Metalocalypse – Season 4:

You are able to buy "Metalocalypse - Season 4" on Apple TV, Amazon Video as download.

Cast

Mark Hamill
Senator Stampingston / Mr. Selatcia (voice)
Victor Brandt
General Crozier / Cardinal Ravenwood (voice)
Malcolm McDowell
Vater Orlaag (voice)
Brendon Small
Skwisgaar Skwigelf / Pickles the Drummer / Nathan Explosion
Tommy Blacha
Toki Wartooth / William Murderface (voice)