Download It Came from Beneath the Sea movie, 1955

After an encounter at sea with an unknown underwater creature, a naval commander works with two scientists to identify it. The creature they are dealing with is a giant, radioactive octopus that has left its normal feeding grounds in search of new sources of replenishment. As the creature attacks San Francisco, the Navy tries to trap it at the Golden Gate Bridge but it manages to enter the Bar area leading to a final confrontation with a submarine.

Cast

Kenneth Tobey	(Cmdr. Pete Mathews)
Faith Domergue	(Prof. Lesley Joyce)
Donald Curtis	(Dr. John Carter)
Ian Keith	(Adm. Burns)
Dean Maddox Jr.	(Adm. Norman)
Chuck Griffiths	(Lt. Griff, USN)
Harry Lauter	(Deputy Bill Nash)
Richard W. Peterson	(Capt. Stacy)
Tol Avery	(Navy intern (uncredited))
William Bryant	(Helicopter Pilot (uncredited))

Del Courtney	(Asst. Secretary of the Navy Robert...)
Roy Engel	(Officer in control room giving orders...)
Eddie Fisher	(McLeod (uncredited))
Sam Hayes	(Himself (radio newscaster) (uncredited))
Jules Irving	(King (uncredited))
Jack Littlefield	(Aston (uncredited))
Rudy Puteska	(Seaman Hall (uncredited))
Ray Storey	(Reporter (uncredited))
William Woodson	(Opening Narrator (voice) (uncredited))