"Drownings!" Zorro and Eulalia Bandini, the woman he's striving to keep from the deadly clutches of Capitan Monasterio, are buried alive when they plunge into an icy chasm that threatens to become their glacial coffin! Elsewhere, near the Yellowstone River, a young couple, Malena Fellini and Burt Douglas, are also on the run from Dennis Scorched, Malena's ex-lover. He wants Malena back at any cost. Zorro and Eulalia try to aid Malena and Burt, and wind up together on a perilous white-water river rafting chase, which unfortunately only leads to the waterfalls and a life-threatening plunge! And somehow, between being buried alive and drowning, Eulalia attempts to unmask Zorro!