The Regulars: Admiral Harriman Nelson, Richard Basehart; Commander Lee Crane, David Hedison (Pictured above); Lieutenant Commander Chip Morton, Bob Dowdell; Chief Petty Officer Curley Jones, Henry Kulky (first season only); Chief Francis Sharkey, Terry Becker (last three seasons); Dr. Gamma, Theodore Marcuse (first season episodes only); Kowalski, Del Monroe; Sparks, Arch Whiting; Patterson, Paul Trinka; Riley, Allan Hunt; Doc, Richard Bull.

The Episodes: First Season-Black & White

1. "Eleven Days to Zero" (9-14-64) Eddie Albert, Mark Slade, John Zaremba, Booth Colman PILOT-In COLOR...the remaining 1st season B & W
2. "The City Beneath the Sea" (9-21-64) Hurd Hatfield, Linda Cristal, John Alderson
3. "The Fear Makers" (9-28-64) Edgar Bergen, Lloyd Bochner
4. "The Midst of Silence" (10-5-64) Rita Gam, Alejandro Rey, Mike Kellin, Edward Colmans
5. "The Price of Doom" (10-12-64) Jill Ireland, David Opatoshu, John Milford, Steve Ihnat, Pat Priest
6. "The Sky Is Falling" (10-19-64) Charles McGraw
7. "Turn Back the Clock" (10-26-64) Nick Adams, Yvonne Craig, Les Tremayne
8. "The Village of Guilt" (11-2-64) Anna-Lisa, Richard Carlson, Frank Richards, Steve Geray
9. "Hot Line" (11-9-64) Michael Ansara, Everett Sloane, Ford Rainey, Robert Carson
10. "Submarine Sunk Here" (11-16-64) Carl Reindel, Eddie Ryder, Wright King
11. "The Magnus Beam" (11-23-64) Mario Alcaide, Malachi Throne, Jacques Aubuchon
12. "No Way Out" (11-30-64) Than Wyenn, Danielle de Metz, Jan Merlin, Oscar Beregi
13. "The Blizzard Makers" (12-7-64) Werner Klemperer, Milton Selzer, Kenneth McDonald
14. "The Ghost of Moby Dick" (12-14-64) June Lockhart, Edward Binns, Bob Beekman
15. "Long Live the King" (12-21-64) Carroll O'Connor, Michel Petit, Michael Pate
16. "Hail to the Chief" (12-28-64) Viveca Lindfors, John Hoyt
17. "The Last Battle" (1-4-65) John Van Dreelen, Joe De Santis, Rudy Solari, Ben Wright
18. "Mutiny" (1-11-65) Harold J. Stone, Steve Harris
19. "Doomsday" (1-18-65) Donald Harron, Ford Rainey, Paul Carr
20. "The Invaders" (1-25-65) Robert Duvall
21. "Indestructible Man" (2-1-65) Michael Constantine
22. "The Buccaneer" (2-8-65) Barry Atwater, Emile Genest
23. "The Human Computer" (2-15-65) Harry Millard, Simon Scott, Ted De Corsia
24. "The Saboteur" (2-22-65) Warren Stevens, Bert Freed
25. "Cradle of the Deep" (3-1-65) John Anderson, Paul Carr, Howard Wendell
26. "The Amphibians" (3-8-65) Skip Homeier, Curt Conway, Frank Graham, Zale Parry
27. "The Exile" (3-15-65) Edward Asner, David Sheiner, Harry Davis
28. "The Creature" (3-22-65) Leslie Nielsen, Robert Lipton
29. "The Enemies" (3-29-65) Henry Silva, Malachi Throne
30. "The Secret of the Loch" (4-5-65) Torin Thatcher, Hedley Mattingly, George Mitchell
31. "The Condemned" (4-12-65) Arthur Franz, J. D. Cannon, John Goddard, Alvy Moore
32. "The Traitor" (4-19-65) George Sanders, Michael Pate
Second Season
33. "Jonah and the Whale" (9-19-65) Gia Scala
36. "The Cyborg" (10-10-65) Victor Buono, Brooke Bundy
41. "The Peacemaker" (11-14-65) John Cassavetes, Whit Bissell, Irene Tsu
42. "The Silent Saboteurs" (11-21-65) Pilar Seurat, George Takei, Bert Freed
43. "The X Factor" (12-5-65) John McGiver, Jan Merlin
44. "The Machines Strike Back" (12-12-65) Roger C. Carmel
45. "Monster from Outer Space" (12-19-65) Lee Delano, Wayne Heffley
46. "Terror on Dinosaur Island" (12-26-65) Paul Carr (pathetic-one of the cavemen is wearing sneakers!)
48. "Deadly Creature Below" (1-9-66) Nehemiah Persoff, Paul Comi
49. "The Phantom Strikes" (1-16-66) Alfred Ryder
50. "The Sky's on Fire" (1-23-66) Robert H. Harris, Frank Marth
51. "Graveyard of Fear" (1-30-66) Robert Loggia, Marian Moses
52. "The Shape of Doom" (2-6-66) Kevin Hagen
53. "Dead Man's Doubloons" (2-13-66) Albert Salmi, Robert Brubaker
54. "The Death Ship" (2-20-66) Lew Gallo, David Sheiner, June Vincent, Elizabeth Parry
55. "The Monster's Web" (2-27-66) Mark Richman, Barry Coe
56. "The Manfish" (3-6-66) Gary Merrill, John Delmer
57. "The Mechanical Man" (3-13-66) Arthur O'Connell, James Darren
58. "The Return of the Phantom" (3-20-66) Alfred Ryder, Vitina Marcus
Third Season
59. "The Monster from the Inferno" (9-18-66) Arthur Hill
60. "Werewolf" (9-25-66) Charles Aidman, Douglas Bank...Commander Crane as a werewolf...really stupid
70. "The Plant Man" (12-4-66) William Smithers
73. "The Creature" (1-1-67) Lyle Bettger
74. "Death from the Past" (1-8-67) John Van Dreelen, Jan Merlin
76. "The Fossil Men" (1-22-67) Brendon Dillon, Jerry Catron.
77. "The Mermaid" (1-29-67) Diane Webber
78. "The Mummy" (2-5-67) regulars only...No guest star could save this episode!
79. "The Shadowman" (2-12-67) Jerry Catron, Tyler McVey
81. "Doomsday Island" (2-26-67) regulars only...more paper dinosaurs
Fourth Season
109. "The Death Clock" (3-24-68) Chris Robinson
110. "No Way Back" (3-31-68) Henry Jones, Barry Atwater,
William Beckley