A biologist is recruited by INTERPOL to investigate a failed submarine expedition to salvage Mechagodzilla's remains, which is thwarted by a massive dinosaur named Titanosaurus. The inquiry leads to a surprising revelation about a brilliant but shunned scientist and his alliance with extraterrestrial beings who seek to unleash a monstrous threat on Tokyo.

Terror of Mechagodzilla
A biologist, shunned by his community, and his daughter become entangled with a revived Mechagodzilla, prompting a worldwide INTERPOL inquiry into the failed efforts to recover the malfunctioning robot.