Regular Series Sub-Mariner
20
"In the Darkness Dwells Doom!"
December 1969
(12/1969)
Doom captures Namor, and suggests they join forces
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"Titans Three!"
February 1971
(2/1971)
A battle erupts in San Pablo as Namor enlists the Silver Surfer and the Hulk
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"Confrontation!"
March 1971
(3/1971)
To stop a nuclear experiment, Namor's team clashes with the Avengers