A radio station engineer named Allan Maxwell establishes contact with an alien being. But when the station's power is turned up, the alien is teleported to Earth where its radioactive nature causes havoc.

A scientist named Ian Fraser invents a machine which can pierce the borderland between this world and... The Afterlife? Maybe. Fraser convinces an industrialist to finance future experiments with the possibility of contacting the rich man's dead son.

Two Martian investigators probe our custom of homicide.

An accident in a nuclear research facility opens a dimensonal doorway and allows deadly creatures to emerge.