Strange Tales, Vol. 1 #130 (1964)

Meet The Beatles! / The Defeat of Doctor Strange
"Meet The Beetles!" - Johnny and Ben take time off from repairing equipment they damaged by heading over to a Beetles concert with Dorrie and Alicia. Before the concert begins, the payroll is stolen, and the two head after the thieves. "The Defeat Of Dr. Strange" - The Ancient One and Dr. Strange face a sudden and potent attack, when Mordo arrives boasting far more power than he's ever had before. The pair are forced to run, with the Ancient One hiding while Strange draws their attention. Neither one has deduced that the source of Mordo's newfound power is none other than Dormammu himself.
Release Date: 1964