Xenomorphs, also known as aliens, are alien opponents encountered in Broforce. They become the standard enemies after the mooks and begin appearing during the missions from Val Verde to Amazone, during the stages of the alien infestation. Xenomorphs appear from an Alien Spawner 0 when off-screen and from an Alien Door while on- and off-screen. Aliens can also spawn when a Facehugger impregnates enemies, after which the a fully-grown Xenomorph bursts out of the corpse and destroying it in the process. Though if an explosive enemy was impregnated, either the corpse explodes too early to prevent this, or the coprse manages to create an explosion that destroys the Xenomorph even after itself is disintegrated.