Species: kingpin (species)
The Kingpin is an alien enemy that was cut from Half-Life. While it lacked convincing AI and gameplay goals, it was scripted nevertheless. It can be found in the game files.
Twice the height of an average person, it was to have a massive brain filling its entire body, with four eyestalks spaced evenly around it. An early version was to walk on three chitinous legs with a clicking sound; a later version, called Sactildiae Nefariousium, traded the rear leg for a thick, worm-like "tail". Its psionic attacks and psionic defenses would have made it immune to missile weapons.