Toho Godzilla Suit 6

Musuko (1967)

Scientists experimenting with changes in weather on a tropical island get more than they bargained for when Godzilla shows up to battle humongous insects and protect his newborn child.
This suit can be seen in these movies:

Unquestionably the ugliest Godzilla suit!

The Musuko-Godzilla had a thick body, a fat neck, small hands and crude, odd-looking dorsal plates. The head was horrible, with a stubby face, oversized mouth with crude teeth and large, glassy eyes placed high on the head and at right angles. This suit was equipped with movable eyes and eyelids. The Musuko-Godzilla would fortunately never again receive a starring role and appeared only once more, for water scenes in Godzilla on Monster Island.

Son of Godzilla (1967) – Japanese Trailer

Musuko Suit Reference Images

The images below were captured from the Criterion Collection Blu-ray, found online, and scanned in from books. Some of the images may have been modified to see the textures more easily.