Rogue Xenomorph

The Rogue Xenomorph is an alien created by Rogue, a mad scientist. It's also been referred to as a "King": a male designed as a weapon to rival the Queen caste, and thus help rid Earth of its alien infestation. The Rogue escaped and wreaked havoc until it was torn apart by a Queen.

Biology
The Rogue is larger and stronger than the Queen, but the Queen possesses greater speed and intellect. This enabled her to dodge the Rogue's attacks, until she was able to land a seemingly fatal blow. (Ernst Kleist, the scientist who engineered the Rogue, subsequently activated a sound cannon on the Queen, which inadvertantly destroyed both the Rogue and Queen along with the entire asteroid base they are on - including Kleist himself).

The Rogue appears to be much more aggressive, and mercilessly attacks smaller Xenomorph castes. Kleist finds the crushed corpses of the Queen's elite Praetorian guard.

Interestingly, the Rogue appears to have been engineered to ignore Humans. When exposed to one, the Rogue examined him closely, but did not attack, and finally it ignored him completely. This may be due to the Rogue caste not having as strong a sense to use Humans to breed as the Queen caste. Or maybe its simply because the Human prisoner was un-armed and restrained so posed no threat. The Rogue's recklessness is also shown when it destroys the barrier that separates the Alien sector and the Human sector, allowing alien drones to pour into the Human sector.

Appearances

 * Aliens: Rogue, comic (1993)
 * Aliens: Rogue, novel (1995)