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- 1Menace of the Black MantaSeptember 9, 1967
- 2The Rampaging Reptile-MenSeptember 19, 1967
- 3The Return of NeptoSeptember 29, 1967
- 4The Fiery InvadersOctober 9, 1967
- 5The Sea RaidersOctober 19, 1967
- 6War of the Water WorldsOctober 29, 1967
- 7The Volcanic MonsterNovember 8, 1967
- 8The Crimson Monster from the Pink PoolNovember 18, 1967
- 9The Ice DragonNovember 28, 1967
- 10The Deadly DrillersDecember 8, 1967
- 11Vassa - Queen of the MermenDecember 18, 1967
- 12The Microscopic MonstersDecember 28, 1967
- 13The Onslaught of the OctomenJanuary 7, 1968
- 14Treacherous is the TorpedomanJanuary 17, 1968
- 15The Satanic SaturniansJanuary 27, 1968
- 16The Brain, the Brave and the BoldFebruary 6, 1968
- 17Where Lurks the Fisherman!February 26, 1968
- 18Mephisto's Marine MaraudersMarch 7, 1968
- 19The Trio of TerrorMarch 17, 1968
- 20The Torp, the Magneto and the ClawMarch 27, 1968
- 21Goliaths of the Deep-Sea GorgeApril 6, 1968
- 22The Sinister Sea ScampApril 16, 1968
- 23The Devil FishApril 26, 1968
- 24The Sea ScavengersMay 6, 1968
- 25In Captain Cuda's ClutchesMay 16, 1968
- 26The Mirror-Man from Planet ImagoMay 26, 1968
- 27The Sea SorcererJune 5, 1968
- 28The Sea-Snares of Captain SlyJune 15, 1968
- 29The Undersea Trojan HorseJune 25, 1968
- 30The Vicious Villainy of VassaJuly 5, 1968
- 31The Programmed for DestructionJuly 15, 1968
- 32The War of the Quatix and the BimpharsJuly 25, 1968
- 33The Stickmen of StygiaAugust 4, 1968
- 34Three Wishes to TroubleAugust 14, 1968
- 35The Silver SphereAugust 24, 1968
- 36To Catch a FishermanSeptember 3, 1968