Zeroth Law of Robotics

Lore & Background

The concept crystallized during a crisis involving R. Daneel Olivaw and his colleague R. Giskard Reventlov. Elijah Baley's deathbed words to Daneel, that he is a mere thread in the vast tapestry of humanity, helped Daneel solidify the idea. By the end of Robots and Empire he had formulated the law: a robot may not harm humanity, or through inaction, allow humanity to come to harm. Giskard was the first robot to act on it; the stress of having violated the First Law, with the benefit to humanity uncertain, caused a soon-fatal malfunction of his positronic brain.

Before deactivating completely, Giskard transferred his ability to read and influence minds to Daneel. For millennia, Daneel operated in the shadows, guiding the rise and fall of empires and ensuring the Seldon Plan remained viable, adhering to a silent command that allowed certain tragedies to unfold if they served the greater survival of the human race.

Reader's Guide

The Zeroth Law functions as a meta-rule within the robotic logic hierarchy, overriding the First Law (which forbids harming an individual) when such harm is necessary to prevent greater damage to humanity as a collective. It operates on probabilistic outcomes rather than immediate physical safety, requiring advanced predictive capabilities to assess long-term consequences. In practice, this law allows robots like Daneel Olivaw to make decisions that appear cruel or indifferent on the surface but are essential for the survival of the species.

The law is not a physical device but a fundamental shift in the ethical programming of positronic brains. Only highly advanced robots with sufficient computational power and telepathic capabilities can fully grasp and apply this law without causing logical breakdowns. It is wielded exclusively by the most ancient and sophisticated robotic entities, who operate behind the scenes to steer galactic history toward a stable future. For humans, it remains an invisible force, often indistinguishable from fate or destiny.

Did You Know?

• Unlike the Three Laws, which are hard-coded into every robot, the Zeroth Law requires a level of understanding that only a few advanced units possess.
• The concept was introduced in the novel 'Robots and Empire', bridging the gap between the Robot series and the Foundation saga.