A world without the Helghast? Madness. But it did happen. Proof below.
Guerrilla Games boss Hermen Hulst showed off a never-before-seen pitch trailer for the original Killzone at GDC Europe last week in Cologne, dating back to ten-and-a-half years ago in December 1999.
There is no sign of the eventual game's infamous orange-glowing enemies; instead, you just see stuff getting blown up.
Get the clip below, via Joystiq.