Season One: (1964-65)
1 – Eleven Days to Zero
2 – The City Beneath the Sea
3 – The Fear Makers
4 – The Mist of Silence
5 – The Price of Doom
6 – The Sky is Falling
7 – Turn Back the Clock
8 – The Village of Guilt
9 – Hot Line
10 – Submarine Sunk Here
11 – The Magnus Beam
12 – No Way Out
13 – The Blizzard Makers
14 – The Ghost of Moby Dick
15 – Long Live the King
16 – Hail to the Chief
17 – The Last Battle
18 – Mutiny
19 – Doomsday
20 – The Invaders
21 – The Indestructible Man
22 – The Buccaneer
23 – The Human Computer
24 – The Saboteur
25 – Cradle of the Deep
26 – The Amphibians
27 – The Exile
28 – The Creature
29 – The Enemies
30 – Secret of the Loch
31 – The Condemned
32 – The Traitor
Season Two: (1965-66)
33 – Jonah and the Whale
34 – Time Bomb
35 – … And Five of Us Are Left
36 – The Cyborg
37 – Escape From Venice
38 – The Left-Handed Man
39 – The Deadliest Game
40 – Leviathan
41 – The Peacemaker
42 – The Silent Saboteurs
43 – The X-Factor
44 – The Machines Strike Back
45 – Monster From Outer Space
46 – Terror on Dinosaur Island
47 – Killers of the Deep
48 – Deadly Creature Below
49 – The Phantom Strikes
50 – The Sky’s on Fire
51 – Graveyard of Fear
52 – The Shape of Doom
53 – Dead Men’s Doubloons
54 – The Death Ship
55 – The Monster’s Web
56 – The Menfish
57 – The Mechanical Man
58 – The Return of the Phantom
Season Three: (1966-67)
59 – Monster from the Inferno
60 – Werewolf
61 – The Day the World Ended
62 – Night of Terror
63 – The Terrible Toys
64 – Day of Evil
65 – Deadly Waters
66 – Thing from Inner Space
67 – The Death Watch
68 – Deadly Invasion
69 – The Haunted Submarine
70 – The Plant Man
71 – The Lost Bomb
72 – The Brand of the Beast
73 – The Creature
74 – Death from the Past
75 – The Heat Monster
76 – The Fossilmen
77 – The Mermaid
78 – The Mummy
79 – The Shadowman
80 – No Escape from Death
81 – Doomsday Island
82 – The Wax Men
83 – Deadly Cloud
84 – Destroy Seaview!
Season Four: (1967-68)
85 – Fires of Death
86 – The Deadly Dolls
87 – Cave of the Dead
88 – Journey With Fear
89 – Sealed Orders
90 – Man of Many Faces
91 – Fatal Cargo
92 – Time Lock
93 – Rescue
94 – Terror
95 – A Time to Die
96 – Blow Up
97 – Deadly Amphibians
98 – The Return of Blackbeard
99 – The Terrible Leprechaun
100 – The Lobster Man
101 – Nightmare
102 – The Abominable Snowman
103 – Secret of the Deep
104 – Man-Beast
105 – Savage Jungle
106 – Flaming Ice
107 – Attack!
108 – Edge of Doom
109 – The Death Clock
110 – No Way Back