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Contrary to popular knowledge, Immortal has released only one demo, and it's untitled.
This demo is also often called "Suffocate", "Suffocate the Masses".
The first source of confusion is the cover. The name of Dead's drawing is "The Northern Upir's Death". Even that drawing is commonly misnamed, mistaken by "The Northern Upins Death". An Upir is a type of vampire from Slavic folklore.
The artwork of this demo was also re-used when the cassette promos for the Immortal EP were released.
Immortal played death metal on this tape. It was recorded before Euronymous got them into black metal.
Recorded at Gamle Slakterhuset, 5th July, 1991.
Produced by Immortal.