Altered Beast Series - Mobygames

Sega's series of shape-changing combat-oriented games, traditionally first and foremost featuring the werewolf, or lycanthrope. While earlier games in the series (including the 2002 successor on Game Boy Color) employed motifs vaguely inspired from Greek mythology, your hero being charged by Zeus to undo the dastardly plots of original demigods Neff and Arcanon, later the series was reconceived in a modern crypto-medical context of bioengineering.