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Altered Beast is an arcade game that has been made for many platforms. There is a very similar game Altered Beast Guardian of the Realms for GBA and Project: Altered Beast for PS2 took the transformations for a more modern twist but has no other relation to original.
The character can kick and punch in human form. Power ups change the character in some way; for example they change appearance and give the ability to throw fireballs.
The player/s in Altered Beast control resurrected human/s whom Zeus orders to rescue Athena.