When skydivers are forced to jump ino a crater by Aliens to deliver a bomb, Jake insists that his dog goes along. Complications arise when his dog is injured and they need help. To their amazement, they find other life forms inside this earth that have ideas of their own. The invaders try to fly straight through the earth with both their ships to create havoc with the inner dwellers. When one ship fail to emerge, they have a bunch of unwilling skydivers deliver a bomb to prevent their technology from getting into their hands.