Fictional extraterrestrial
kind of fictional creature that does not originate on Earth
Ion
Mark Chang
San Hill
Replicator
Dax
Max Rebo
Riddick
Sensor
Mi-go
Ming the Merciless
Nibbler
Shade, the Changing Man
Phantom Ranger
Goa'uld
Alien
Black Dwarf
Lockheed
Mister Mind
Observer
Scorpius
Savage Dragon
Ridley
Parallax
Arbiter
Symbiote
Collector
Louie
King Mondo
Red Shift
The Doctor
Spartan
Stardust
Tyrant
Nemesis Kid
Ch'p
Colonist
Devlin O'Ryan
Dream Boy
Frank the Pug
G'nort
Magno
Grey Matter
Matter-Eater Lad
Magus
OK Quack
Upgrade
Polar Boy
Ruck
Stone Boy
Upchuck