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Onus is the tertiary antagonist in Treasure Planet. He is a small slug-resembling alien bearing six eyes and is one of the pirates in John Silver's crew. As such, he serves as the lookout, as he is constantly seen in the crow's nest of the Legacy. He is one of the only few pirates to survive during their mutiny, as he is arrested by Captain Amelia and Dr. Delbert Doppler for his crimes alongside the remaining crew.



  • Onus's voice sounds similar to that of Judge Doom's Toon persona.

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