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- Character Gallery
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- Chaugnar Faugn
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- Count Venamus
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- Crewmates and Impostors
- Crex
- Critters
- Cromulon
- Crop circle
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- Culisetto
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- Dark Skies Alien
- Darph Bobo
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- Deacon
- Dead Dom Alien
- Decoy
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- Denver Alien
- Derek's Tlaloc
- Derelict
- Derriphan-class battleship
- Dexter Jettster
- Diet of an alien
- Dimensional Horror
- Dinosaur (Chip 'n Dale: Rescue Rangers)
- Dinosauria
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