The runaway success of "Jaws" back in '75 not only heralded the arrival of the summer blockbuster, but it birthed the still-thriving horror cinema subgenre of shark stories. This documentary takes an affectionate look back at a half-century of knock-offs that provided mucho movie marine mayhem, from the "Jaws" franchise sequels to "Orca," "Open Water," "Sharknado," "47 Meters Down," and more; Roger Corman, Joe Dante, Mario Van Peebles, Johannes Roberts, Anthony C. Ferrante, and other creators speak. 106 min. Widescreen; Soundtrack: English; audio commentary; featurettes.