Neal Adam's Batman: Odyssey is one of the most bizarre, surreal, hilarious, incomprehensible vomit-splatters of excess ever committed to the comic page. After running 6 issues, it disappeared from shelves, after revealing in issue 5 a plot twist that (contra the insanity of surrounding events) illustrated a (I thought) very clever insight into the nature of Batman.
[Spoiler? ~ the idea that Batman is being "distracted" (by "clowns" (Joker, Riddler, etc.) who "escape" (yeah right) on a regular basis from so-called Arkham Asylam) from some real, deeper (implication: non-clown) problem / conspiracy / evil.]
Why did the series disappear? It appears from dropped sales and (more specifically) a lack of solicits. Neal Adams himself put out a plea to fans to encourage their local stores to solicit the rest of the story. Help the cause! Don't you want to see the "neanderthals, evolved dinosaurs, magicians, war, death, gnomes, trolls and tests, the like of which Batman, the modern Ulysses has never faced in his life... all happening in a real underworld" ?
If you doubt, check out this extremely entertaining review / summary / homage.