Allan Maxwell is an engineer who has dedicated himself to researching microwave background noise using a device powered from his radio station. He inadvertently gets an extraterrestrial being from Andromeda on his three-dimensional television screen. Using his computer, Maxwell is able to translate the being's thought patterns into English. Both are conducting illicit experiments; Maxwell should not be using the radio station's power, and the being is not allowed to use equipment for exploration. The being asks about the human's "holes in face", whereupon Maxwell explains the purposes of his nose and mouth. The being explains that it is a "nitrogen cycle" life form, that there is "no death in our dimension", and that wars are "... forbidden. Reason we are not allowed to contact you, you are danger to other galaxies." The two have further enlightening philosophical conversation, in which no epistemological basis is given for the Andromedan's affirmation that Maxwell's "brain waves" will "go on" subsequent to the death of his carbon-based body. The being explains, "electromagnetic forces underlying all ... electromagnetic force intelligent" and "Infinity is God. God, infinity, all the same", in response to Maxwell's query regarding whether the being believes in God as an intelligent force. Maxwell appears to accept the Andromedan's explanations as the knowledge of a superior being.




Much of this interaction, along with Maxwell's earlier discussion of Faraday with his wife, is a play on James Clerk Maxwell, the father of electromagnetic theory and his predecessor Michael Faraday, as is the alien's reference to quaternions when stating that its species uses "4 dimension numbers" to identify themselves rather than names.




In the evening, Allan reluctantly leaves the radio station to be feted at a banquet. He leaves the channel open to the extraterrestrial being who warns, "Do not increase power levels." DJ Eddie Phillips, who is substituting for Allan's brother Gene "Buddy" Maxwell, after being told not to, turns up the power to full, causing the extraterrestrial to be transmitted to Earth as a three-dimensional electromagnetic being. The 'Galaxy Being', as it is dubbed, wreaks inadvertent havoc, killing Eddie and injuring several other people by burning them with natural radiation. The extraterrestrial encounters Allan in person, who convinces it to turn down the heat, and then guides it back to the transmitter shed. They are soon cornered by local authorities, who accidentally shoot Allan's wife, Carol. The Galaxy Being then uses beneficial radiation to heal the wound.




When the Galaxy Being emerges, the authorities attempt to kill it; but it protects itself by destroying the bullets in flight, again with radiation. As a warning demonstration (and perhaps to prevent other aliens from coming), the Galaxy Being destroys the transmitter tower. The crowd is told, "There are powers in this universe beyond anything you know ... there is much you have to learn. Go to your homes. Go and give thought to the mysteries of the universe. I will leave you now, in peace." At this, the crowd disperses.




The Galaxy Being then chooses not to return home inasmuch as it has violated a law forbidding contact with Earth. So, after first reassuring Allan that "There is no death for me," answering his concerns that it would disintegrate, the Galaxy Being reduces its microwave intensity which causes it to fade out from the Terran realm. Its last words as it vanishes into another putative dimension are "End of transmission".[2][3]




Closing narration