Comic Book: Sub-Mariner (1968 series)

Sub-Mariner #1

May 1968
"Years of Glory -- Day of Doom!"
Script: Roy Thomas
[...]

Sub-Mariner #2

June 1968
"Cry... Triton"
Script: Roy Thomas
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Sub-Mariner #3

July 1968
"On a Clear Day You Can See... the Leviathan!"
Script: Roy Thomas
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Sub-Mariner #4

August 1968
"Who Strikes for Atlantis?"
Script: Roy Thomas
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Sub-Mariner #5

September 1968
"Watch Out for... Tiger Shark!"
Script: Roy Thomas
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Sub-Mariner #6

October 1968
"...And to the Vanquished-- Death!"
Script: Roy Thomas
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Sub-Mariner #7

November 1968
"For President-- The Man Called Destiny!"
Script: Roy Thomas
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Sub-Mariner #8

December 1968
"In the Rage of Battle!"
Script: Roy Thomas
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Sub-Mariner #9

January 1969
"The Spell of the Serpent!"
Script: Roy Thomas
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Sub-Mariner #10

February 1969
"Never Bother a Barracuda!"
Script: Roy Thomas
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Sub-Mariner #11

March 1969
"The Choice and the Challenge!"
Script: Roy Thomas
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Sub-Mariner #12

April 1969
"A World Against Me!"
Script: Roy Thomas
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Sub-Mariner #13

May 1969
"Death, Thou Shalt Die!"
Script: Roy Thomas
[...]

Sub-Mariner #14

June 1969
"Burn, Namor ... burn"
Script: Roy Thomas
Sub-Mariner is in the Pacific Ocean (where he's been in Lemuria for the past 2 issues) when he meets sea creatures fleeing from an area containing 2 active volcanic islands, and dead creatures closer in. When he  reaches 1 of the islands he's attacked by the Human Torch. [...]

Sub-Mariner #15

July 1969
"The Day of the Dragon!"
Script: Roy Thomas
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Sub-Mariner #16

August 1969
"The Sea That Time Forgot!"
Script: Roy Thomas
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Sub-Mariner #17

September 1969
"From the Stars -- the Stalker!"
Script: Roy Thomas
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Sub-Mariner #18

October 1969
"Side by Side with... Triton!"
Script: Roy Thomas
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Sub-Mariner #19

November 1969
"Support Your Local Sting-Ray!"
Script: Roy Thomas
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Sub-Mariner #20

December 1969
"In the Darkness Dwells... Doom!"
Script: Roy Thomas
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Sub-Mariner #21

January 1970
"Invasion From the Ocean Floor"
Script: Roy Thomas
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Sub-Mariner #22

February 1970
"The Monarch and the Mystic!"
Script: Roy Thomas
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Sub-Mariner #23

March 1970
"The Coming of Orka"
Script: Roy Thomas
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Sub-Mariner #24

April 1970
"The Lady and the Tiger-Shark"
Script: Roy Thomas
[...]

Sub-Mariner #25

May 1970
"A World My Enemy"
Script: Stan Lee
[...]