One-shot bridge between Iron Man and Sub-Mariner sharing Tales of Suspense and starting their own solo series. Though the two appear together on the cover, they do not appear together in the stories inside. (Note added by Kirk Groeneveld via the GCD Error Tracker.)
Story continues from Tales of Suspense #99 (March 1968); continues in Iron Man #1 (May 1968).
Story continues from Tales to Astonish #101 (March 1968); continues in Sub-Mariner #1 (May 1968).