In the words of the villain, 'I knew that tuna-head wasn't up to much.'
Trailer for the movie's American release. under the title 'Godzilla Vs The Smog Monster' - 'can Godzilla save the Earth from this mastodon of destruction?!?'
Son of Godzilla (1967) Japanese Theatrical Trailer
Godzilla Vs. Mechagodzilla (1974) Japanese Trailer