- Welcome to your Doom! - Neff
Neff, known as Majin (魔神, "magician", "sorcerer", "demon god", ...) in Japan, is an evil wizard loyal to Hades, the god of the underworld. He is the antagonist in Altered Beast and the one who captured Athena, the daughter of Zeus.
Neff is found at the end of every stage, where he transforms into the boss for that stage. The Neffs in early stages are fakes, the real one appearing only in the last stage.
If the Centurion didn't transform into a beast when he finds Neff, he'll leave and the player will need to continue the stage until transforming or until reaching Neff for the third time, at which he'll transform regardless of whether the Centurion is a were beast or not.
- King Ogre (NES version only)
- Moldy Snail
- Kraken (NES version only)
- Crocodile Worm
- Great Demon (NES version only)
- Van Vader
Neff, in his Van Vader (rhinoceros) form, has a cameo appearance in the 2012 Disney film, Wreck-It Ralph as part of Ralph's villains support group, Bad-Anon. Here he has his damaged color instead of the normal gray.