Via Youtube, Star Trek vs. Star Wars. Only problem is that Star Trek is represented by the lameass TNG crew. Picard vs. Darth Vader? Give me a break — while Picard was having an existential crisis over the Prime Directive, Vader would chew him up and spit him out.
Not Kirk vs. Vader — that would be a real fight. The toupee vs. the helmet. Phasers vs. light sabers. And, of course, who picks up more hot chicks — Kirk or Han Solo.