Det här låter som Starchaser: The Legend of Orin , en animerad sci-fi-äventyrsfilm från 1985. Huvudpersonen heter Orin, inte Orion, men resten passar.
In the future on a planet named Trinia, human slaves have lived underground for millennia mining crystals for a "god" named Zygon and his robot minions. One day Orin, a young miner, finds a jeweled sword embedded in the rocks. Hopps, grandfather of Orin's girlfriend Elan, recognizes the sword and gives his life to save Orin and keep the sword a secret.
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Orin digs a tunnel to the surface of Trinia, where he is later captured by Man-Droids, a group of decaying half-organic, half-robotic beings who intend to tear him apart and use his body parts to replace their own.
(JaghittadedettaavGoogling"sci-fi cartoon orion".)