Beastie is a lab rodent that in an accident gets all the power's of the monsters in the world. So he can became a vampire, werewolf, the monster of the lagoon and Hyde.

Doctor Spector, Beastie's master has been working hard in some experiments to get the monster essence which is the thing that make a monster a monster.

The Evil Phantom hear this and kidnap Dr. Spector to apply his experiment for military use.

So it's up to Beastie to defeat Phantom and rescue his master!