Shadow is a female "Gargantuan Leviathan", several decades old, living on the planet "4546B", which is now under quarantine and is composed of 99% water. Her species, the "Gargantuan Leviathans", went extinct approximately 3 million years ago due to a significant decline in food resources on the planet "4546B", caused by the emergence of the "Kharaa Bacterium", which decimated nearly 95 billion individuals. Its species was so large that it could only live in the "Dead Zone". Shadow was recreated from the DNA of ancient "Gargantuan Leviathan" skeletons.