Kaylon 1 was once home to an unnamed species of organic lifeforms who created the Kaylon race as servants. The Kaylon, however, soon developed sentience and, after failing to peacefully negotiate for their freedom, rebelled against their creators, utterly exterminating all organic life on the planet, burying the Builders' remains in a series of caves beneath the planet before they rebuilt their world into a perfect mechanical society.
In the 25th Century, Kaylon society had grown to a point where they had exceeded the informational capacity of their world. Needing to colonize space, the Kaylon Primary dispatched Isaac to infiltrate and observe the neighbouring Planetary Union and discover if the organics were worthy of surviving or had to be eliminated.
In 2420, the Kaylon felt Isaac had gathered enough data and deactivated him. Unaware of this, the USS Orville brought Isaac back to Kaylon 1 to have him repaired. Seeing in the ship a way to sneak past the Union defences, the Kaylon stalled Mercer until they were ready to take the ship, seizing it as their flagship as their invasion fleet launched. Though the Kaylon initially held the upper hand in the Battle of Earth, they retreated back home when the Krill fleet joined the fight.
Kaylon 1 is a very ruthless, logical, and technology driven society. The physical form of any Kaylon are assembled within factories and their program forms are expected to behave in rigid and predictable patterns, only what they were designed to do. If any of them act out of the ordinary, they are terminated without hesitation.On my planet, when a program is not functioning properly, it is deleted.— Isaac explaining the process for handling disruptive behavior on Kalyon 1.
Kaylon 1 is led by an organization or entity known as Kaylon Primary. They first revealed themselves to the USS Orville after temporarily terminating Isaac's programming once he has acquired a sufficient amount of data on biological lifeforms.
Kaylon attitudes towards biologicals is one of supremacy. They consider all biologicals intellectually and physically inferior and see nothing new to learn from any of them. In addition, they predict biologicals will eventually betray and enslave them like the Builders once did.
The Union is one civilization seen with suspicion and the data gathered allow the Kaylon to make a decision of genocide.
- In A Happy Refrain, Issac states that the planet has a circumference of 57,583km, an average density of 4.42g/cm^3, and a gravity of 1.13g. The math, however, would place such a world's gravity as 1.15 to 1.16g. Whether this is an error or an indication that the Kaylon society has begun hollowing out their world is unclear.
- It is unclear whether Kaylon 1 was the planet's original name or one that the Kaylon bestowed upon it once they took over.
- Episode 1x01: Old Wounds (mentioned only)
- Episode 1x07: Majority Rule (mentioned only)
- Episode 1x08: Into the Fold (mentioned only)
- Episode 2x06: A Happy Refrain (mentioned only)
- Episode 2x08: Identity, Pt. 1
- Episode 2x09: Identity, Pt. 2 (mentioned only)
- Episode 2x13: Tomorrow, and Tomorrow, and Tomorrow (mentioned only)
- Episode 2x14: The Road Not Taken (mentioned only)