Brian Saves the World, Maybe

Observers

From TV's Data Banks

The first Observers arrived in 1962, as cloned replacements of existing humans. They were exact replicas, not merely in body but also in mind. The cloning process included the complete brain state of the replaced human. Yet there was one significant difference. The Observers had a biological chip in their brains which provided two key functions. First, it enabled the Borae to monitor human activity, and second, it enabled two-way communication with the Observer.

These first Observers seemed perfectly normal to anyone that had known the originals. And largely they were normal. In fact, they didn't know they were clones. At least, most of their brains didn't. The bio-chip took care of that. There was a part of the brain that had memories associated with being an Observer, but this was only activated when required, and when deactivated, the Observer had no knowledge of its true allegiance.

The Borae did have one problem, though. They didn't want to be in the business of constant human cloning, and they needed a way to renew their Observer supply as the originals aged, and ultimately assumed room temperature.

Fortunately, humans had a solution for that, and the Borae were now in the reproduction business.

Observers were allowed to procreate with other Observers. Secret Facilities were set up throughout the world to accommodate bio-chip implants. Not only did this solve the room temperature problem, but it also allowed Observers to be fruitful and to multiply on the Earth.