All characters of the show who are creatures or other living beings that come from anywhere outside of Earth.
Note: Beings from other dimensions do not count as aliens. Characters in this category must come from a different planet or place in outer space, but still exist within the show's main dimensions (which are the Prime Dimension, Dimension C-131 and the Parmesan dimension).
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- Galactic Federation President
- Gar Gloonch
- Garblovians
- Garmanarnar
- Garthamor
- Gazorpazorpfield (Character)
- Gazorpians
- Geardude
- General Store Owner
- Germaphobic species
- Gibble Snake
- Glar
- Glarb
- Glaxo Slimslom
- Glenn
- Glootie
- GlorpDieBlorp
- Gobo
- Gordon Lunas
- Gorpathian Dermaks
- Greebybobes
- Greg
- Gromflomite guard 4
- Gromflomites
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- Grunglokians
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