Experimental Genetic Aliens, also called Canister Aliens, are common alien enemies found throughout the levels. They scratch when up close and spit acid when at a distance. They come in two different forms.
The first encountered form, called the Small Canister Alien, resembles a brown, imp-like creature.
The second form, called the Large Canister Alien, is a tall, green humanoid.
Both aliens are sometimes found inside canisters, which, when shot, can break open and release the alien inside. Some canisters cannot be broken.