Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Del Monroe (Kowalski)
And: Bob Dowdell (Chip Morton)
Written By: Shimon Wincelberg
Directed By: Sobey Martin
Ep: 34
Time Bomb
Guest Star: Ina Balin (Litchka)
Co-Starring: Susan Flannery (Katie)
Also: Terry Becker (Chief Sharkey), John Zaremba (Admiral Johnson), Dr. Harold Dyrenforth (Doctor), Richard Loo (Li Tung), Richard Gilden (Tal), Lee Millar (Soldier), Jon Kowal (Policeman), Frank Delfino (Boy - Midget)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Sobey Martin
Ep: 35
...And Five of Us Are Left
Guest Star: Phillip Pine (Ryan)
Also Starring: Robert Doyle (Werden), Teru Shimada (Nakamura)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), James Anderson (Wilson), Ed McCready (Hill), Kent Taylor (Johnson), Francoise Ruggieri (Brenda)
And: Bob Dowdell (Chip Morton)
Written By: Robert Vincent Wright
Directed By: Harry Harris
Ep: 36
The Cyborg
Special Guest Star: Victor Buono (Tabor Ulrich)
Co-Starring: Brooke Bundy (Gundi)
Cast: Terry Becker (Chief Sharkey), Del Monroe (Kowalski), Nancy Hsueh (Tish Sweetly)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Leo Penn
Ep: 37
Escape From Venice
Co-Starring: Renzo Cesana (Count Ferdie Staglione), Vincent Gardenia (Bellini), Delphi Lawrence (Julietta)
Cast: Allan Hunt (Riley), Lloyd Kino (Policeman), Terry Becker (Chief Sharkey), Walter Woolf King (Hansen), George Zaima (Scientist), Lee Kolima (Junk Captain), George Young (Lang's Accomplice)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Sobey Martin
Ep: 42
The Silent Saboteurs
Guest Star: Pilar Seurat (Moana)
Co-Starring: George Takei (Cheng), Bert Freed (Halden)
Cast: Alex D'Arcy (Lago), Terry Becker (Chief Sharkey), Del Monroe (Kowalski), Phil Posner (Stevens)
And: Bob Dowdell (Chip Morton)
Teleplay By: Sidney Marshall
Story By: Max Ehrlich
Directed By: Sobey Martin
Ep: 43
The X Factor
Guest Stars: John McGiver (Alexander Corby)
Co-Starring: Jan Merlin (Henderson)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), George Tyne (Liscomb), Bill Hudson (Captain Shire)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Del Monroe (Kowalski), Arch Whiting (Sparks), John Gallaudet (Admiral Johnson), Bert Ramsen (Senator Kimberly), Al Shelly (Murphy)
And: Bob Dowdell (Chip Morton)
Written By: John and Ward Hawkins
Directed By: Nathan Juran
Ep: 45
The Monster From Outer Space
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Del Monroe (Kowalski), Wayne Heffley (Seaview Doctor)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: James Clark
Ep: 46
Terror on Dinosaur Island
Co-Starring: Paul Carr (Benson)
Cast: Terry Becker (Chief Sharkey), Del Monroe (Kowalski), Paul Trinka (Sonar Man)
And: Bob Dowdell (Chip Morton)
Written By: William Welch
Directed By: Leonard Horn
Ep: 47
Killers of the Deep
Guest Star: Michael Ansara (Captain Tomas Ruiz)
Co-Starring: Patrick Wayne (Fraser)
Cast: James Frawley (Manolo), Bruce Mars (Bosun's Mate), John Newton (Commander Richard Lawrence), Dallas Mitchell (Sonar Man - Destroyer), Gus Trikonis (Sonar Man - Sub)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Harry Harris
Ep: 48
Deadly Creature Below!
Guest Star: Nehemiah Persoff (Dobbs)
Co-Starring: Paul Comi (Hawkins)
Cast: Terry Becker (Chief Sharkey), Del Monroe (Kowalski), Wayne Heffley (Seaview Doctor)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Sobey Martin
Ep: 49
The Phantom Strikes
Guest Star: Alfred Ryder (Krueger)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Del Monroe (Kowalski), Paul Trinka (Patterson)
And: Bob Dowdell (Chip Morton)
Written By: William Welch
Directed By: Sutton Roley
Ep: 50
The Sky's on Fire
Guest Star: David J. Stewart (Weber)
Co-Starring: Robert H. Harris (Carleton), Frank Marth (McHenry)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Del Monroe (Kowalski)
And: Bob Dowdell (Chip Morton)
Teleplay By: William Welch
From a Screenplay By: Irwin Allen & Charles Bennett
Directed By: Gerald Mayer
Ep: 51
Graveyard of Fear
Guest Star: Robert Loggia (Ames)
Cast: Marian Moses (Karyl), Del Monroe (Kowalski), Allan Hunt (Riley), Arch Whiting (Sparks), Paul Trinka (Patterson)
And: Bob Dowdell (Chip Morton)
Written By: Robert Vincent Wright
Directed By: Justus Addiss
Ep: 52
The Shape of Doom
Co-Starring: Kevin Hagen (Holden)
Cast: Allan Hunt (Riley), Del Monroe (Kowalski), Arch Whiting (Sparks)
And: Bob Dowdell (Chip Morton)
Written By: William Welch
Directed By: Nathan Juran
Ep: 53
Dead Men's Doubloons
Guest Star: Albert Salmi (Brent)
Cast: Del Monroe (Kowalski), Paul Trinka (Patterson), Allen Jaffe (Sebastian), Bob Swimmer (Pirate)
And: Bob Dowdell (Chip Morton)
Written By: Sidney Marshall
Directed By: Sutton Roley
Ep: 54
The Death Ship
Guest Star: David Sheiner (Chandler)
Co-Starring: Lew Gallo (Stroller), Elizabeth Perry (Tracy), Harry Davis (Templeton), June Vincent (Ava)
Cast: Terry Becker (Chief Sharkey), Allan Hunt (Riley), Ivan Triesault (Klaus), Herbert Voland (Carter), Ed Connelly (Rourke)
And: Bob Dowdell (Chip Morton)
Written By: Michael Lynn & George Reed
Directed By: Abner Biberman
Ep: 55
The Monster's Web
Guest Star: Mark Richman (Gantt)
Cast: Allan Hunt (Riley), Del Monroe (Kowalski), Barry Coe (Balter)
And: Bob Dowdell (Chip Morton)
Teleplay By: Al Gail & Peter Packer
Story By: Peter Packer
Directed By: Justus Addiss
Ep: 56
The Menfish
Guest Star: Gary Merrill (Park)
Special Guest Star: John Dehner (Borgman)
Co-Starring: Victor Lundin (Hansjurg)
Cast: Del Monroe (Kowalski), Roy Jenson (Johnson), Lawrence Mann (Diver), Wayne Heffley (Seaview Doctor)
And: Bob Dowdell (Chip Morton)
Written By: William Read Woodfield & Allan Balter
Directed By: Tom Gries
Ep: 57
The Mechanical Man
Guest Star: James Darren (Omir)
Special Guest Star: Arthur O'Connell (Paul)
Cast: Allan Hunt (Riley), Del Monroe (Kowalski), Cec Linder (Van Druten), Seymour Cassel (Jensen)
And: Bob Dowdell (Chip Morton)
Written By: John Hawkins & Ward Hawkins
Directed By: Sobey Martin
Ep: 58
The Return of the Phantom
Guest Star: Alfred Ryder (Krueger)
Co-Starring: Vitina (Lani)
Cast: Allan Hunt (Riley), Del Monroe (Kowalski), Richard Bull (Doctor)