Trivia: One of the film's most common criticisms is that the CGI for the Scorpion King is notably of a lower quality than all of the other effects. There's actually a reason for this. The character was an early attempt at attempting to make a photorealistic humanoid, and thus the effect took much more work to complete. Additionally, the effect was made before a technique called "subsurface scattering" became prevalent, thus causing the plastic-like sheen on the skin. (Subsurface scattering is a technique that simulates how light penetrates and/or reflects off multi-layered surfaces like skin, thus allowing more realistic lighting and a less plasticy look.) It was so complicated trying to get the character to look "right," that they simply ran out of time and had to use what they had done, even though it wasn't quite complete.