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This question already has an answer here:

Spock was the only Human-Vulcan half breed because he was genetically created, not born. In an interview between Gene Roddenberry and Sarek (played by Mark Lenard, of course) on the album Inside Star Trek, Sarek reveals the origins of Spock through casual conversation. He was a test-tube child, incubated outside of his mother because humans and Vulcans are naturally incompatible.

So, would Spock even be able to have children? Is it possible that Spock is actually sterile, like most species cross-breeds in biology?

marked as duplicate by Jason Baker, Valorum star-trek Jan 12 '15 at 1:31

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    we know their are tons more half blood children, and that in enterprise it was alluded that a simple drug was all that was needed for humans and vulcans to mate cross species. so while this may have been originally true what your saying, the 40 years of trek cannon has changed almost everything you said. – Himarm Oct 29 '14 at 20:49
  • What episode of Enterprise? I don't recall that, but then all I ever really watch is the 4th season. :P – Mighty Ferengi Oct 29 '14 at 20:50
  • when their in the expanse they meet another enterprise that either went back in time or was stuck, anyway the captain of the ship was tpol and tuckers child, and i believe he also had children of his own on board. the doctor had made a drug that allowed them to have children. i cant remeber 100% what it was but, from what we know about tucker i doubt hed have liked having a child that grew up outside of tpol, he was very much a traditionalist and that would have very much put him off. – Himarm Oct 29 '14 at 20:54
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    I'll have to consult Netflix! – Mighty Ferengi Oct 29 '14 at 20:55
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    Star Trek IV: The Voyage Home was originally intended to reveal that Lieutenant Saavik was pregnant with Spock's child. This was dropped, however, supposedly at the request of Leonard Nimoy. Not an answer, but it shows which way they originally wanted the wind to blow... – Omegacron Oct 29 '14 at 20:58
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Yes, it's absolutely possible for Spock, and any other alien hybrid, to have children. Several relevant episodes of Enterprise are referenced in the comments, which I want to expand on.

The episode Future Tense revolves around the Enterprise crew discovering a ship from the future. The pilot's corpse is found inside, and Doctor Phlox determines that it was the result of many generations of inter-species breeding. In particular, it had DNA from Humans, Vulcans, and Terrellians, as well as others that Phlox couldn't identify.

A later Enterprise episode, E2, involves a future version of Enterprise run by the descendants of the original crew. The crew of this ship is about two generations removed from the main cast and the First Officer, Karyn Archer, is Captain Archer's grand-daughter. Karyn's grandmother is specifically said to be an alien, which means that Karyn's father was a half-Human who successfully reproduced.

In a more concrete example, Worf has a son by K'Ehleyr, introduced in the TNG episode The Emissary. K'Ehleyr constantly points out that she's only half-Klingon, and yet she and Worf have a child with no problems.

A similar case occurs in Voyager: human Tom Paris and half-Klingon B'Elanna Torres have a daughter, born in the episode Endgame.

EDIT: As HorusKol points out in comments, the Next Generation episode The Drumhead involves Crewman Simon Tarses, who had a Romulan grandfather.

The Star Trek mythology even explains how this is possible. A late episode of The Next Generation, The Chase establishes that all humanoid species in the galaxy share common genetic material with a progenitor race, who specifically seeded the galaxy to create different humanoid species:

A member of the humanoid Progenitor race

Although it kind of flies in the face of known genetics, it's a good enough explanation for Star Trek.

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    TNG episode "The Drumhead" had a starfleet crewman who was one-quarter Romulan. I'm sure there's even more examples. – HorusKol Oct 29 '14 at 22:36
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    the 1 quarter romulan crewmember makes 100% sure, as romulans and vulcans are the same species only about 2000 years apart with micro-evolution not changing them enough to be different in an significant way. (not that i didnt already believe based off of the rest of the proof here) – Himarm Oct 30 '14 at 0:34
  • @HorusKol Nice catch; I have no doubt that there are tons more examples, but that's a quite significant one so I'll add it – Jason Baker Oct 30 '14 at 1:30
  • I'll say Worf and K'Ehleyr had no problem concieving Alexander, since they weren't trying to have a child. The same on VOY with Tom and B'Elanna concieving Miral. – pleurocoelus Aug 29 '17 at 9:03
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In the Star Trek novel "Yesterday's Son", it's revealed that Spock and Zarabeth (seen in the TOS episode All Our Yesterdays) had a child named Zar.

From the blurb:

"The starship Enterprise must protect the Guardian – or destroy it. But Spock has already used the portal to journey to the past. On the planet Sarpeidon, 5,000 years ago, Spock knew a beautiful, primitive woman. Now he has gone back to meet his son!"

The cover even sports a picture of the boy in question:

enter image description here

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    Apparently that hair style is genetic - who knew. – PopularIsn'tRight Oct 30 '14 at 3:58
  • @Bachrach44 - lol, actually in the novel once they meet Zar styles his hair after his father's on purpose. He tries to emulate the Vulcan but is ultimately too emotional. – Omegacron Oct 30 '14 at 16:10
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    @Omegacron fascinating. – PopularIsn'tRight Oct 31 '14 at 0:55

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