The original plan for Predator 2 was for Arnold Schwarzenegger to return, using salvaged Predator tech from the first movie to continue the good fight. However, Schwarzenegger didn't want to come back, so the writers had to scramble for a new idea. They ultimately settled on Predator vs Danny Glover in LA, but the sequel could have potentially been much different. At a screening celebrating the 30th anniversary of Predator, writer Jim Thomas told the crowd in attendance (via Facebook) that they considered setting Predator 2 during the height of World War II. The idea was to unleash the Predator on a group of waring American and Nazi soldiers who had reached a stalemate and would have to team-up to kill the Predator. The writers liked the idea of seeing the Predator in the snow, but ultimately decided against the idea.
It's a cool sounding and imaginative concept -- at least compared to what they originally went with -- but it's not perfect. Not only is it a huge departure from the first Predator (this should be like Predator 6 after all the other ideas are gone), but it sorta kinda portrays Nazis as the good guys in the context of the film by making them team up with America to kill the real villain. You're supposed to sympathize with the humans the Predator is killing, not root for Predator to win. But it doesn't matter because they went with gang wars, voodoo, and Gary Busey in LA, so it worked out.
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