Help to remember the name of the movie!

All good...
What a film, tell me!
Plot: there is a colony on another planet, which has broken the law, or simply unwanted are exiled outside the city walls. And they have an hour to move away from the walls, along with scarce supplies issued to them, if not go - kill them.
Several people cooperated with one of former rulers (as it turned out), who was banished for trying to curb the arbitrariness of the authorities of the colony, and they are trying to reach the Shuttle, along the way battling a very dangerous phenomena and to each other (Yes, there is a killer who goes with the group only to see the former ruler does not reach). In one scene, one of the exiled fell to the ground, and there to it immediately stuck to some hair, as the mycelium, and slowly but actively began to entangle, so stand it has failed...
In the end, of course, the Shuttle there is only room for one, but will survive the Governor and the woman, and fly away together... And, of course, will inform where follows, and in a colony descend on the squad..
What movie was that?