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Helio-Grub were a small, grub-like insect species which glowed in the dark. They could be picked up with the OmniWrench Millennium 12 and used a sort of flash light by Ratchet in the dark Morrow Caverns of Planet Merdegraw. They could only be found in small pools in the caves. They could be used to explore dark places, but more importantly, to get rid of creatures that are frightened of light, like Thwogs.
- Ratchet & Clank Future: Quest for Booty (first appearance)
- Ratchet & Clank: All 4 One
- Ratchet & Clank (PS4) (re-imagined Helio-Grub)
- Ratchet & Clank (movie) (re-imagined Helio-Grub)