Outlaw Sam is standing on the gallows when he is accidentally saved due to huge metallic alien bug creatures invading the town, killing almost everyone and then drilling down into the ground. The small group of survivors try to figure out what the creatures want, how to get out of town, and how to kill the creatures.
Meanwhile the local bounty hunter is more concerned about getting the reward for Sam and his buddy, while Sam's old love interest tends to a wounded woman whose husband was killed by the bugs while doing work with Uranium. What? Who works with Uranium? Oh wait, there's a Uranium mine in town and you know how much aliens love Uranium.
This is typical syfy channel stuff (although I don't know if it was produced for them). It's cliched and lacks any excitement.