It's well known that often, CGI doesn't look quite right. It's too shiny, too regular. It doesn't even move properly. Some artists don't just recognise this - they exploit it. This trope is for when CGI is deliberately used to make something look weird and alien, providing a glaring visual contrast with the rest of the show. Compare Conspicuous CG (the Super Trope to this), Sinister Geometry (which is often created through CGI for this purpose) and the Uncanny Valley.
Hello, Unknown Troper. You'll need to get known to lend a hand here.