Numbering continues with Marvel's Greatest Comics (Marvel, 1969 series) #23. On sale date as listed in the Catalog of Copyright Entries, Periodicals, 1969, page 215, registration number B526663, with a correction factor of plus 28 days.
Henry Pym invents a shrinking serum, but is trapped in an ant hill when he tests it. He is attacked by several ants, but one of them helps him escape and restore his ordinary size. He destroys the serum because it is too dangerous.
In the far East, Strange is on the run from Mordo and his minions, unaware that Mordo's increased power comes from Dormammu. As Mordo forcibly recruits more followers to search for Strange, the mage makes plans to hop a plane to NYC. The Wraiths discover him, and only by conning them into believing he's vanished is he able to make his getaway.