Experimental Mutant Humans are large, intimidating mutated humans. They come in two forms.

The first form is only found in Blake Stone: Aliens of Gold. It spits acid from a distance and punches
Experimental Mutant Human

Mutant Human about to punch

when close. It resembles a giant Kilby Qello the coyote/werewolf

The second type is found only in Planet Strike. It has a different appearance and is usually cloaked as a seemingly harmless statue. It then morphs to attack the player. It throws energy and also punches when close.

Experimental Mutant Human2 ingame

Mutant Human as seen in Planet Strike