None.

Some gore and bloodshed during the monster fights. Gigan slices Godzilla in the shoulder and blood spurts from the wound. Later, Gigan repeadedly stabs Godzilla in the head and some blood spurts and drips down his head. Gigan also slices Anguirus in the face and blood splatters all over the screen.

A dying man is seen with some blood on his face.

Swearing including damn, hell, and one use of "bitch".

One of the main characters smokes a lot.

When the good monsters begin to be defeated by the bad ones, this may be distressing for some.