First up of my X-Men Evolution posts is the shape-shifting Mystique. After being exposed to Magneto's machine and enhancing her powers, she very briefly had an appearance similar to that of the live-action movies. Sadly, this was the only time she ever looked like this, since in season 2 onward she wore black leather and boots.
Bit of trivia: the creators of the show originally wanted Mystique to look like her movie appearance, meaning blue, scaly, and essentially nude (and barefoot). But KidsWB wouldn't allow it, so this is as close as we'll ever get, unless Marvel decides to make a new X-Men cartoon somewhere down the line.