Tremors (2003)

S1E12 Water Hazard

The townsfolk of Perfection are struggling financially, prompting Rosalita to take a position at Melvin's new enterprise, the Oasis. Unbeknownst to them, some of the water used for the lagoon is tainted with Mixmaster, producing a monstrous six-foot shrimp. When Melvin's efforts to eliminate the creature inadvertently force it out of the lagoon, Tyler and the gang must act quickly to prevent it from escaping into the surrounding wilderness.