Is there a God?
I cannot necessarily explain the story of Rock 'n' Roll Nightmare in any other form other than a quick summary, because there is little to be explained. A rock band (Triton) goes away to a barn in the middle of the Canadian wilderness to practice playing music. There, the band and their groupies have gratutious sex and "practice" maybe twice. Eventually all the members, except Jon Mikl-Thor (the lead singer), succumb to the dark and very unexplained forces that surround the area. People get "possessed" or mauled by a monkey-werewolf child in the basement.
There are also one-eyed thumb monsters that run around and make scared faces at the events occuring around them. These are also not explained.
Finally, Jon Mikl-Thor is about to be confronted by the dark forces (revealed to be the Devil in a rubber-cockroach puppet form) and he explains to the Devil that everyone who was killed earlier in the film was made up in Jon Mikl-Thor's mind; this is because it turns out that his character is actual the arch-angel of rock 'n' roll named Triton. They were all figments of his imagination--inspired characters from horror movies. The Devil then trails off this thought with the comment: "I thought I recognized one of the band members from one of the Friday the 13th movies." (This is paraphrasing.)
They proceed to have a "fight" where Jon-Mikl Thor dodges rubber-demon-starfish thrown at him and he conquers the Devil.
In between all of this nonsense, we get random transitional shots of the landscape accompanied by a MIDI keyboard choir of "people" screaming and first-person perspective shots of something quickly running around the house. Oh, and an oven (or was it a refrigerator? (it doesn't matter)) eats someone.
This film is really hard to get into at first due to its ten minute driving montage of the band inside a van traveling to their Canadian death-barn. Once you get past that point, it's full on "what-the-fuck-is-going-on" and it's absolutely great.