What was this game called? I remember playing it at my friend's house

They did our lad Kyle so dirty. Bro stole the death star plans all by himself and they didn't even give him a cameo in the movie i can't remember.

I loved this game, I first discovered my love of mods because of it; so, so many mods, also played a ton against a user made bot addon.

So many well crafted user made single player levels too to test new weapon mods with.