A web channel called BatintheSun does this series of "Super Power Beatdown" where they pit characters from various series against each other to see who would win. After a bit of a discussion back and forth, we get a movie where actors (and sometimes actresses) portraying the characters do battle. The results are determined by the viewer votes beforehand (BUT on occasion they'll film "alternate" endings which show a different outcome.)
They're done several of these and, I gotta say, they're actually pretty good. Granted, some are better than others, but keep in mind this isn't Hollywood where they've got millions of dollars to spend on effects, but still, it's very entertaining to watch.
As the title suggest, this episode is Batman vs Darth Vader. The first video is the original outcome as determined by the viewer votes. If anyone wants to skip the discussion beforehand and head start to film, it starts on 3:33.
The second video is the alternative ending, which also has a prologue that explains more about the background of the story (which, for some reason the first video didn't have, maybe they added it in later for clarification?)
I present both for your enjoyment!
(Remember skip to 3:33 if you want to bypass the fan speculation)