I did this a while ago... Forgot to do Dempsey, that's why his style looks a little different. ^^;
Any way... A few friends of mine, we all were playing black ops 1 zombies on Der Riese... Had a lot of fun, so I sketched this pic out right quick...
I played as "THE DOCTOR!"

Just a little pic... ^^;

Characters belong to their creators...
Cod zombies belongs to Treyarch