Impressive "Super Smash Bros. Source" Video Imagines a Valve Fighting Game

What if Valve made a fighting game featuring a cast of characters from Left 4 Dead, Half-Life, Team Fortress 2, and Portal? It's probably never going to happen (unless they all start appearing as playable Heroes in Dota 2), but one talented animator created a video that imagines what the opening movie for that game might look like. YouTube user Crazyhalo (via Polygon) explains that "Super Smash Bros. Source" is set to the style and tune of Super Smash Bros. Melee's opening movie, with elements f...