A King Alien is a type of Xenomorph.
The "King Alien" was created by Kenner as part of their Aliens toyline. It appears to lack the ridge on the tail. It looks more like an actual spine, rather than a skeletal ridge. Its head crest is very elaborate, with six points and what appears to be retracting pieces of armor on the side of the head. In the Kenner action figure, it has two pincers on the sides of its head. They clamp shut to grab objects.
The king was created by the Weyland-Yutani company to be used as a super weapon that would be hostile enough to create what could be used to kill all other xenomorphs on a planet. Making the King Alien more of a weapon that was a counter measure of sorts.
Behind the ScenesEdit
There are no instances of male aliens such as this in the Canon of AVP outside of the toy created by Kenner and superfluous material associated with it. There was a Rogue Xenomorph created by a mad scientist that was once referred to as a "King".