Species which spend their lives mostly or entirely underground.
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- Galax
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- Geonosian
- Gerra Raptor
- Gerra Scorpion
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- Ghast (The Dream-Quest of Unknown Kadath)
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- Giant Crawler
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- Glok Monster
- Glyphid
- Gnome (The Spaceman's Van Gogh)
- Gorax
- Graboid
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- Greater Spotted Jellyfloat
- Gryghr
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- Ma'arphin Beast
- Mactera
- Makrak
- Maoi
- Martian (Daleks Versus the Martians)
- Martian (Invincible)
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- Martian (Marooned on Mars)
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- Martian Gopher
- Martian Predator
- Merdlidop
- Merdoc
- Miner (Twig)
- Mole Man (Futurama)
- Mole People
- Mole-man
- MoleEster
- Molite
- Monsterbot (Transformers: Cyberverse)
- Moon Mite
- Moorwen
- Morlock
- Mountain Meat Beetle
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- Muktian
- Mykara
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