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2000's movie, post-apocalyptic, with zombies

So it's a movie from 2000's, it's a post-apocalyptic movie with zombies in it. I don't remember much but i remember that whole humanity was uneducated, they didn't know anything about "people before them" (us).

In first 30 minutes of movie, they were trapped in a cave, they couldn't get out because zombies were all around that cave. Their quest was to look for some yellow (or some other color) dust, which can cure zombies and reverse them back to humans. They will travel to some city, which is all ruined after whatever happend to people before them. In that city, there was some guy who was something like a king and he has this yellow dust which he didn't want to give to anybody. I know it's not much but please help me, I love that movie! Even if it's not right, still thanks for trying.
asked Jul 20, 2015 in Name That Movie by Jayce (6 points)

1 Answer

 
Best answer
"The Lost Future"
http://www.imdb.com/title/tt1615091/
https://en.wikipedia.org/wiki/The_Lost_Future

"However before he died, he made a "yellow dust" which keeps people from becoming zombies (oh - I mean mutants). So the son must use his reading skills (and apparently the ability to understand chemical structures) to make more "yellow dust."

Full movie is on Youtube here:
https://www.youtube.com/watch?v=7VHEw1R7_Uo
answered Jul 20, 2015 by casspir (18,441 points)
selected Jul 20, 2015 by Jayce
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