When Trent sneaks into the Dixon building, he "talks" to his hand, and the glove covering it is a much lighter shade than in all subsequent shots, where it is a dark brown verging on black.
In the opening narration, the word "Sumerican" is used by mistake instead of Sumerian. This was due to a typing error during production of the scripts.
Control Voice: (opening narration) Through all the legends of ancient peoples--Assyrian, Babylonian, Sumerian, Semite--runs the saga of the Eternal Man, the one who never dies, called by various names in various times, but historically known as Gilgamesh, the one who has never tasted death...the hero who strides through the centuries...
Trent: I was born ten days ago. A full-grown man, born ten days ago. I woke on a street of this city. I don't know who I am, or where I've been, or where I'm going. Someone wiped my memories clean. And they tracked me down and tried to kill me. Why? Who are you? I ran. I managed to escape them the first time. Then the hand, my hand, told me what to do.
Consuelo: I'm sorry, it's just that I can't stand violence.
Trent: When it's gone this far, it's more than just violence.
Battle: I'm prepared to die.
Trent: How prepared? Why not give yourself a couple of minutes?
Battle: We all knew we would die when we came on this mission. It was worth it.
Trent: You can stay alive in this time.
Battle: I don't care about that. Helping my race is more important.
Trent: Bargain week on patriots.
Battle: Call it what you like. I'm not afraid to die.
Trent: Really? Then why are you whispering? You Kyben were always super patriots, especially when you bombed Earth from ten miles out. How does your patriotism sit with burning women and children alive?
Battle: That's war.
Trent: So's this
Trent: (referring to death) I was in a dark place. Someone was calling my name, over and over, down in a long corridor.
Trent: To save all of Man, I have to become a killer.
Control Voice: (closing narration) Like the Eternal Man of Babylonian legend, like Gilgamesh, one thousand plus two hundred years stretches before Trent. Without love. Without friendship. Alone: neither man nor machine, waiting. Waiting for the day he will be called to free the humans who gave him mobility. Movement, but not life.
Robert Culp also provides the "voice" of the glass hand.
1966 WGA Award (TV) Winner, this episode garnered Harlan Ellison a Writers Guild of America award for best writing for a TV anthology, any length.
The building where this was filmed, is the Bradbury in Los Angeles, and was used for the cat and mouse game between Deckard and Roy in Blade Runner. It has appeared in quite a few other movies.
Ellison originally discussed doing a sequel for the TV series Babylon 5, which would have shown Trent coming to the station while still pursued by the Kyben. (The title that was announced was "Demon on the Run." Ellison says that this was never the title) These plans never materialized.