Godzilla vs. Gigan(1972)

Defeat the evil space monsters! You can protect the Earth, Godzilla!

Manga artist Gengo Odaka lands a job with the World Children's Land amusement park only to become suspicious of the organization when a garbled message is discovered on tapes. As Gengo and his team investigate, Godzilla and Anguirus quickly decipher the message and begin their own plan of action.