Simon and Eugene discuss the effect of emotions on intelligence, taking out gods with technology, and they look back over a quarter of a century of poetry by Tarbolde from Canopius planet.
The USS Enterprise is on a mission to become the first known Earth ship to explore beyond the edge of the galaxy. As they approach, they discover and retrieve a ship’s recorder from the USS Valiant, a ship lost 200 years ago. Could it be that another ship has previously left the galaxy?
Second-in-command, Mr. Spock tries to decode the badly damaged ship’s recorder. The Valiant was caught in a storm and swept past the edge of the galaxy. When it returned, the ship received heavy damage, and several crew members were killed. Through the garbled data, Spock gathers that they were frantically searching for information on ESP and then… could that be correct? Did he hear the Captain of the Valiant order their own destruction?
Captain Kirk of the Enterprise gathers his division heads on the bridge, including newcomer psychiatrist Dr. Dehner, for one last consultation before they leave the galaxy. With no hard data, and the need to learn what’s out there, Kirk orders the Enterprise to continue.
The “edge” of the galaxy is a bit of a misnomer, for as they approach, they are confronted with an expansive energy field of some kind that defies analysis with their equipment, as they attempt to pass through it, the ship and members of the crew are subjected to wild electrical forces. Heavily damaged Kirk orders the ship to exit the barrier. Two of the bridge occupants have been knocked unconscious. Dr. Dehner was mildy knocked down, but Helmsman Gary Mitchell took a strong shock. He seems to be alright, but his eyes are glowing.
The Enterprise is crippled, with their warp drive damaged, Earth bases are years away.
Spock has found a connection between Mitchell, Dehner, and the nine crew who died in the barrier: They all had the highest ESP ratings on the ship – Mitchell’s highest of all. Dr. Dehner argues that ESP is a largely ineffectual ability in humans and that there is no danger from it. Spock argues that perhaps there are other forms of ESP that might be. The crew of the Valiant was frantic for information about ESP.
In Sickbay, Mitchell feels fine, and the readings confirm that. They also cannot find a reason for the glowing eyes. Mitchell is one of Kirk’s oldest friends and when he visits his friend is Sickbay, Mitchell knows it is Kirk even before he sees him. Mitchell has been catching up on his reading, and while friendly, there’s an air of superiority as he chats with his old friend. Kirk orders him to remain in sickbay for more tests. Momentarily, Mitchell’s voice booms unnaturally.
Spock is observing Mitchell from the bridge, he’s reading books at an incredible speed, and that speed increasing. As they watch him on the monitor, Mitchell seems to turn to them and look back.
Dehner is in Sickbay studying Mitchell. Mitchell jokes that maybe his medical reading should be abnormal, and suddenly they are. He just thought about it and it happened. Then, he makes himself die, and come back. Mitchell tells Dehner that he’s gone through half the ship’s library in a day, and she asks if he remembers it all. He does, in eidetic detail.
Things are beginning to get a little intense between them when Navigator Lee Kelso arrives to check on his friend. Mitchell immediately tells him that the starboard impulse pack has almost burnt out and a skeptical Kelso beats a hasty retreat. Mitchell tells Dehner that Kelso is a fool. He’d seen the damage and didn’t notice it. Mitchell saw the image still in his mind.
At a staff meeting, Kelso is showing off the damaged part, exactly as Mitchell described it. Dehener arrives late to the staff meeting and is critical of Kirk and Spock for treating Mitchell with suspicion. Kirk asks if Mitchell has demonstrated any powers and Dehner downplays what’s she’s seen
Engineer Scott reports that recently, the ships controls went crazy, as if they were operating themselves, and all the while, on the montitor, Mitchell was smiling.
Kirk, again to Dehner, has he shown any powers like that?
“And you didn’t bother to report it?”
Dehner argues that an improved human could be a good thing, the next step in human evolution.
At his current exponential increase in power, soon the crew will be nothing but an annoyance to him.
After the staff meeting is adjourned, Spock gives his recommendations to the reluctant Kirk. Make course for the uninhabited planet Delta Vega, hope that we can use the mining equipment there to fix the ship, and strand Mitchell there before it’s too late. The only alternative: Kill Mitchell now, while he still can. Kirk orders a course for Delta Vega.
When arrive at the planet, Kirk and Spock go to sickbay. Not only does Mitchell know what they plan to do, he chides Kirk for not following Spock’s recommendation, “you should kill me while you have the chance.” But it appears to be too late, Mitchell overcomes Kirk and Spock with lightning bolts. He doesn’t want to be stranded.
Powerful, but not all powerful, Kirk gets a moment to knock Mitchell down and he is sedated. They get him to the transporter and beam down to the planet, locking him in a makeshift cell.
The equipment seems promising, and Kelso thinks he can repair the ship’s engines. Kirk gives him one other task: Rig up a self-destruct mechanism for the mining facility and, if Mitchell escapes, blow it up.
In the cell, Mitchell has gone full-on megalomaniacal. He tries to walk through the force field, but is repeatedly thrown backwards until his eyes return to normal. Spock urges they kill him now. Mitchell pitifully calls to his friend Kirk but then the glowing eyes return before they can act.
In the control center, Kelso has just finished his repair job for the Enterprise, when cables slip around his throat, killing the man with his hand on the self-destruct button.
In the cell, Mitchell mocks Kirk’s compassion, deactivates the field, stuns Kirk and Spock and takes Dr. Dehner in to look at her newly-glowing eyes.
Later, Dr. Piper finds Kirk and revives him. He saw Mitchell and Dehner head off. Kirk follows with a phaser rifle.
Mitchell now dares think of himself as a god. He can create a paradise on this planet. He tells Dehner she’ll enjoy being a god, she’s on the same path as him. Mitchell detects Kirk, and he sends Dehner to talk to him, to see how insignificant humans are.
Kirk makes his appeal to the psychiatrist in Dehner to help him. Michelle has god-like powers with all his human frailties, all the ugly things that humans dare not let out. Mitchell will dare.
Mitchell arrives. Kirk shoots him with the phaser rifle to no effect. Mitchell is going to kill his old friend, but he’s going to toy with him first, and make him pray to him. Kirk makes his last appeal to Dehner. “Above all else a god needs compassion.” “Absolute power corrupting absolutely, and in the end, there will only be one of you left.”
This strikes home, and Dehner attacks Mitchell with lightning bolts. Caught off guard, Mitchell is weakened. They trade lightning bolts and both collapse. Mitchell’s eyes fade, and Kirk seizes his chance. They fight, and when Kirk gets the upper hand and is in a position to kill Mitchell, he hesitates. Too late, Mitchell’s eyes glow again, his strength returning.
With time running out, Kirk manages to use the phaser rifle to drop a giant boulder on top of Mitchell, killing him. Kirk goes to Dehner who apologizes but says you can’t know what its like to feel like a god, and she dies.
The Enterprise, fully repaired, leaves orbit. Kirk records both Dehner and Mitchell’s deaths as in the line of duty.