Gordon Freeman

A bald man in a white lab coat and glasses stands in a hallway, then appears on a screen behind a man in a black and grey outfit holding a skull with the name "BARNEY" on it, while the man in the black outfit looks surprised. The scene cuts to a group of identical bald men in lab coats running across rooftops, followed by a black screen with a yellow sun, and ends with two of the bald men in lab coats screaming.