The Royal Beast of Peladon, feared as a cursed creature but actually trained by High Priest Hepesh using a hypnotic device to cause accidents and maintain superstition. The Doctor eventually brings the beast to confront Hepesh, resulting in the High Priest's death.
The Doctor ultimately uses Aggedor to resolve the conflict and eliminate the high priest.
Hepesh exerts absolute control over Aggedor through conditioning and technology.
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