It's just an experiment I've been making in a new program I got named "Moho" which uses "Bone System". I drew the doom guy myself but Trimble is an example character that comes with the program. That means I didn't draw him but I did the animations. Sorry there's no preloader, Moho doesn't support actionscript and I couldn't import the animation into Flash because then it'll look weird (fills disappear in certain frames and make strange shapes). The file size is so big because it's all frame-by-frame action (that's how Moho works).
All in all I guess it's fun to watch him kick the guy's ass... :-)
And please remember that it's just an experiment with the bone-system animation of Moho.