“Tremors: A Cold Day In Hell” (*1/2 out of four) was a crude, stupid sequel in this now tired series showing the redneck warrior Burt Gummer (Michael Gross) and his none-too-bright son (Jamie Kennedy) at a remote and frozen research station where they must go up against more of the ugly worms who have now been converted into dangerous weapons. Sixth and least of this series that began back in 1990 has Gross’ enthusiasm but that’s it. Whereas the original was fresh and fun, this one is silly and routine and running on the desperate fumes from the first one. It should be a cold day in hell before they make any more entries.