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Cool! I found it. It was the paperback called NeverWhere (1978) by the author Richard Corben. There was a short animated version released in 1968 also called NeverWhere.

Segment in animated movie heavy metal with Den, I really have to find that awesome paperback story with all the cool artwork . The book was like probably and inch thick or more, not thin like your...

Look up comic series called "DEN". I don't remember the name of the comic book my uncle showed me, but it was thick, main characters name was Den or ?Dan maybe uncle dan, transported into a crazy...