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Great Leader was a computer that ruled Zordin (later Atlantis) and a dozen other planets at some point in history. He forbade all knowledge of events before "Year Zero", which was the start of his rule. (AUDIO: Year Zero)

He taunted Bernice Summerfield, Leonidas and Ruth when they entered Poseidon's labyrinth. He told them about the Epoch. (AUDIO: The Temple of Questions)