Storyline:
An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace.

Cast:

Tim Holt Lt. Cmdr. John 'Twill' Twillinger

Audrey Dalton Gail MacKenzie

Hans Conried Dr. Jess Rogers

Barbara Darrow Jody Simms

Max Showalter Dr. Tad Johns

Medium: Original DVD,

Loaned: No

Aspect ratio: 1.85:1