Halflife UD : Vorts and family

Alien controllers : The Alien Controllers share many characteristics with the other Xen creatures, especially the Nihilanth, suggesting that they may be a younger or smaller version of the Nihilanth's species, or that the latter may be a unique mutant form of a Controller.The Alien Controllers have disproportionately large heads, which could peel open to reveal an apparently mechanical spike or cone, resembling the interior of the Nihilanth's skull. Can levitate and can attack by firing multiple spheres of electrical energy (resembling ball lightning) from their hands.

Vortigaunt : Vortigaunts are very intelligent and social creatures. Vortigaunts will often run away, and if possible, group together with other Vortigaunts to form a stronger force. Vortigaunts were enslaved by the Nihilanth and used as workers and drone soldiers. Can shoot green lighting from hands.

Alien grunt : Tough, strong, and extremely hostile, Alien Grunts stand about seven feet tall and are armed with a biological weapon called the Hivehand, which shoots biological "bullets" known as hornets. At melee range, it will also use weaponless hand-to-hand combat. Alien Grunts share many features with their Vortigaunt counterparts: multiple red eyes, backwards-jointed legs, hoofed feet, and a short arm extending from their mid-torso, which is used for feeding.