Notes:
Slight crossover with Aquaman #56 as confirmed in the introduction to Marvel Masterworks: The Sub-Mariner Volume 8. Only Aquaman's hand is shown, pressing a satellite destruct button, with the same thought balloon as in the DC story.
Sub-Mariner appears next in Giant-Size Defenders #3.
He becomes a co-feature with Doctor Doom in the series Super-Villain Team-Up, which picks up the Atlantis sub-plot.
Notes:
Editorial afterword and final closing notes from Roy Thomas and letters of comment from Ed Heyne; Brian Schuck; Peter Cucich; and Randall Freeman. The single illustration is a panel detail reprinted from page one of issue #70. The Marvel Value Stamp #100 (the final one in Series A) is revealed to be Galactus.