Altered Beast

Altered Beast is a 1988 arcade video game published and released by Sega for the Sega Mega Drive. The game's plot involves a resurrected Roman centurion tasked by Zeus, to save his daughter Athena from a Demon God called Neff in the Underworld. In order to withstand the perils, the warrior gets the ability to collect three spirit balls on each level, the last of which transforms him into a human/animal hybrid of formidable power.

Amongst the forms the centurion could assume are the werewolf, a thunder weredragon, a werebear, and a weretiger.