A publicity agent has a large paper mache monster created to promote a new movie. Unknown to anyone on Earth, an alien invasion force is drawing near when its commander orders the viewscreen to display a typical Earth creature so they will know what to expect. When the viewscreen picks up the large monster, the alien commander panics and orders a full retreat.; A scientist creates a pill to shrink himself to subatomic size, convinced that whole other worlds exist at microscopic levels. His pill works, and he vanishes into a whole new world called Earth.; A cruel hunter pursues a sea monster for sport, but finds himself at its mercy. The creature is intelligent and telepathically berates the hunter, leaving him alive to suffer the punishment of never finding anyone who believes his story.; A surface man finds himself in an underwater world where their doctors have converted his body to survive under water.