Hunter is a pirate who orchestrates the kidnapping of Warrius Zero as a strategic ploy to defeat his enemy, Captain Harlock. He uses Zero as bait to lure Harlock into a confrontation, seeking an advantage over the notorious space pirate.

The decisive battle occurs on a planet with a mushroom-like terrain, where Harlock is bound by a promise to guard his friend Tochiro's hidden laboratory. Amidst the colliding agendas of Zero, Harlock, and Sylviana, Hunter pursues personal objectives. His actions escalate the conflict, forcing Harlock and Zero into an uneasy, temporary alliance to counter his threat.

Hunter's schemes drive the central conflict, exploiting the fates of others to advance his pirate goals against Harlock. The confrontation on the fungal planet represents the culmination of his plan.