My Billion-Dollar Zombie Fortress

Reborn before the zombie outbreak, Wayne Wright buys and fortifies an island. Zombies evolve to cross the sea, besieging it with mutant creatures. Wayne fights back, discovering the crisis source: a mysterious deep-sea geometric object controlling zombies. Island collapsing, he discovers its frequency vulnerability. He reunites with Kitty, and they build a frequency jammer to paralyze its control, buying time to find its core and destroy the threat.