It is no secret that Neo Zeed has always used science and laboratories to conduct unimaginable bioexperiments with genetics. However, it is known only to very few that the organization dumps its waste and failed experiments/leftover experiments into the acid-filled sewers below. A certain number of these experiments have managed to adapt to the acid, and even assembled themselves to create a massive and hideously grotesque lifeform: Hydra a.k.a. The Body Weapon.
Being able to sense Joe Musashi upon his descent into the waste-ridden sewers, the hideous lifeform attemps to lurk in the shadows and ambush him. Despite the lifeform being the embodiment of past failed experiments, it has a near-perfect aim with the laser it shoots from its mouth. Afer failing to destroy Musashi from a distance, the hideous lifeform attacks head-on.