Nightmare Fuel / The Parasite War

The colloids' monstrous offspring, dubbed the 'Neonate' by the rebels. It was a giant life form made by the colloids gelling and molding together around a skeleton to look like a human, but rather ghastly in some of its features. And worse is the way it kills at last one of the rebels.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/TheParasiteWar