Mort Weisinger; E. Nelson Bridwell (assistant editor)
On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 23, Part 2, Periodicals, January-December 1969. Class B periodical. Copyright registration number B537992.
Lois Lane; Superman [also appears as Clark Kent]; Perry White; Professor Danton (alien in disguise); Lori Lemaris (alien in disguise); Ronal (flashback)
Clark and Lois investigate a sea monster sighting, and arrive to find Lori Lemaris sending it away by telepathy. She claims that her husband Ronal has died and she wants to rekindle her romance with Superman, but then she mysteriously disappears.
Lois Lane; Superman; Professor Danton (alien in disguise); Lori Lemaris (alien in disguise); Lyla Lerrol (alien in disguise); Luma Lynai (alien in disguise); Jor-El (cameo flashback); Lara Lor-Van (cameo flashback); Supergirl [Kara Zor-El] (cameo flashback)
After both Lyla Lerrol and Luma Lynai appear and remind Superman of their past love, Lois figures out that the girls are all shapeshifting alien criminals from the planet Durla who are trying to drive Superman mad.