Polyrobo

Zentradi Regult Battle Pod (real world name), sometimes called Walking Mech, is a robot used in GoldSrc skeletal animation demonstration.

Overview
The demonstration was shown to Next Generation in August 1997. The robot, made off 6000 polygons, with chrome textures and having only 20 bones, danced in small room to demonstrate the cheapness of skeletal animation, in contrast to vertex animation expensiveness. The robot was intended to crash the engine, however, it didn't.

Origins
The robot itself is based off Zentradi Regult Battle Pod from The Super Dimension Fortress Macross anime television series.

Trivia
Many players think that it's early version of Gargantua, however, it is completely different robot.