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The Jellyfish were creatures encountered on the Planet Kortog. They were first found in the Hall of Knowledge, but could also be found flying around Stratus City while using the Robo-Wings. They had tentacles which resulted in certain death for Ratchet both in and out water; however, they were not aggressive and like all jellyfish, they were just drifters.
- They were probably based upon the Man of War jellyfish.
- You could use the Gelanator on them and reach otherwise unaccessable places.
- Ratchet & Clank Future: Tools of Destruction (first appearance)