De Ja Vu
You may be looking for the Star Trek: TOS anthology Deja-Vu.
|Title:||De Ja Vu|
|Date(s):||1992 or before|
|Fandom:||Star Trek: TOS|
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This may be related to Twin Tales of Trek.
From an ad in The Monthly 7-5: "Back to visit Natira twenty years later, McCoy has a big, double-trouble surprise waiting for him. in the meantime, guess who grabbed poor Chekov? You got it! Tamoon. Just what he needed. That, and a planetary gone pandemic and experiencing planet-wide riots. Our crew is up to their proverbials this time!"
From an ad in FYI Adzine: "McCoy goes to see how Natira is doing, many years later, and has quite a surprise waiting for him. His twin sons by Natira, whom he never knew existed, are in a battle for control of the planet. Chekov gets kidnapped by Tamoon...and I don't need to tell you how much he doesn't enjoy that! And the crew finds themselves in a fight for their lives while trying to fight a terrible plague on a planet gone mad."