“Tremors: Shrieker Island” (* out of four) was an abysmal sequel to a once-great monster movie about a wealthy young hedonist (Jon Heder) who for vague reasons imports the monster graboids to his own private island and it’s once-again up to redneck monster hunter Burt Gummer (Michael Gross) to save the day. Seventh in this series suggests an episode of “Duck Dynasty” gone terribly wrong; even Gross looks bored and appears to be going through the motions and some of the visual effects and action scenes are awful. Die-hard fans of the series would fare better just re-watching the original.