Sunny, a lowly circus clown, dreams of following in his father's footsteps by perfecting the lethal Flying Dagger technique. That dream seemingly dies the night a group of bullies force Sunny into a mysterious cave where an abandoned military experiment turns them all into mutants! Suddenly bestowed with superhuman strength, Sunny finally has the power to master his father's technique and defend the city against his fellow horribly disfigured mutants!