The Zetans are a race of intergalactic travelers from the Zeta Galaxy. They have blue skin, long pointed ears and seemingly no hair. They operate the Zeta Galaxy Law Enforcement Bureau, employing humanoid robotic officers.
Strangely, they have been seen patrolling territory in the Milky Way Galaxy, suggesting that they may have legislation over it. Alternatively, perhaps a simpler explanation would be that "Zeta Galaxy" is simply their designation for the Milky Way. The name was originally said by the Robot after he managed to translate the aliens' language, so this is possible.
- Lost in Space, s03e11 - "Deadliest of the Species" (1967)