The teenage DJ is observing his neighbor Nebbercracker on the other side of their street in the suburb that destroys tricycles of children that trespass his lawn. When DJ's parents travel on the eve of Halloween and the abusive nanny Zee stays with him, he calls his clumsy best friend Chowder to play basketball. But when the ball falls in Nebbercracker's lawn, the old man has a siege, and soon they find that the house is a monster. Later the boys rescue the smart Jenny from the house and the trio unsuccessfully tries to convince the babysitter, her boyfriend Bones and two police officers that the haunted house is a monster, but nobody believes them.
A princess from a small Himalayan country becomes possessed by the spirit of a Venusian (a Martian in the American version) and escapes a plane just as it explodes. As this happens a meteorite falls from the sky containing Ghidorah, the monster responsible for her planet's destruction. At the same time, Godzilla and Rodan emerge from hibernation and not only attack Japan, but each other as well. Mothra, along with its twin priestesses, attempt to convince Godzilla and Rodan to stop their fighting each other and to team up to fight the new monster. At the same time, the princess is being hunted by a group of assassins who want to kill her so that her enemies can take over her homeland.