Sea creatures cause disaster on a Texas lake; Laura runs afoul of the government in her probe; Rich suffers from debilitating flashbacks; Cirko makes a startling discovery that links the beings to global warming; and Miles continues to tend to a baby creature.

U.S. waters draw a creature, tracked by Rich and Laura via a GPS device to a California waterway, where a monster surfaces---to the astonishment of locals and tourists. Meanwhile, Nimrod gets loose in a large grocery store; and Laura faces Cirko's scrutiny.