The Observer homeworld is the home to The Observers, a race of beings who seem to be nearly-omnipotent. The Observers sent Mike and the Bots films from the planet while they experimented on them, Pearl Forrester, and Professor Bobo.

The Observer homeworld had few recognizable landmarks or features other than a vast, barren white landscape interspersed with white obelisks. The Observers would create furniture, appliances, or other objects with their minds as the need arose.

The planet was accidentally destroyed by Mike Nelson when he was trying to create a distraction. Pearl and Bobo escape, taking one Observer along with them in The Widowmaker.

Eventually, the Observers reformed their planet and came for Brain Guy, but he tricked them into becoming Wisconsinites and he did not return to the reformed planet. A delegation from the Observer homeworld later attended Kinga Forrester's abortive wedding to Jonah Heston.

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