...when a lone drone finds itself without a hive, let alone a Queen to serve itself under, it finds a host and turns that one into an egg, explaining the
SuperFacehugger. The Facehugger lays three embryos inside three hosts
(or at least is known for up to three), and one of them is a
Queen embryo. That's why, in Alien 3, Ripley at the end of Alien 3 had a ChestBurster with a Queen-crest on its head
(sorry if I'm mistaken, again I haven't seen Alien 3 for almost a year now) burst out of her as she fell into the lava, or whatever it was. In the games, they changed the SuperFacehugger to a
Preatorian Face hugger, which made/explains the
Preatorian, thus it turns into a Queen when the current one is found dead.
"To me, everyone is crazy. The ones in the Mental House just got caught."