While we've seen the Left 4 Dead 2 gang holding their own in Resident Evil 6, we've yet to see Valve's side of this crossover event on PC. Above you can see the Napad in Left 4 Dead 2, a tank variant you can add to your game through Steam Workshop. The Napad is a fusion of infected corpses, all mashed together in some horrifying, Akira-like monstrosity.
The PC version of Resident Evil 6 launched on March 22. The Left 4 Dead 2 cast will be playable through a free update, available for download this Friday.