In the Star Trek Discovery episode S01:E13 What's Past is Prologue we see a spore landing on Tilly's shoulder.

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There is some speculation about this:

  • An opening for Hugh to return?
  • Mirror Lorca possession?
  • A tardigrade egg?
  • some personality remnants of the real Captain Killy.

My question is: What was the significance of the spore that landed on Tilly's shoulder in Discovery?

  • A deleted comment was saying to watch a certain episode in S2, but I can't remember which one.
    – Jenayah
    Feb 3, 2019 at 19:36
  • 4
    The answer was given in memory-alpha.fandom.com/wiki/Point_of_Light_(episode) Feb 3, 2019 at 19:38
  • @EdmundDantes - I stand corrected. You should post that as an answer to the question, not a comment
    – Valorum
    Feb 3, 2019 at 20:00
  • @Valorum, I know, but I was too lazy to do that that evening, so I left it for somebody else to claim :) Feb 5, 2019 at 9:34

1 Answer 1


Major season 2 (episode 3) spoilers, so if you don't want them, don't continue reading.

The spore was from the jump back to the prime universe from the terran universe. The spore was a mirror-spore which got into Tilly and infected her. After coming into close contact with the dark-matter asteroid fragment, it began communicating with Tilly. It appeared as an apparition of her dead school friend.
The infection was removed and placed into containment by Stamets.

  • Can you confirm in which episode this is revealed and provide an actual quote?
    – Valorum
    Feb 4, 2019 at 6:43
  • S2E3 at the very end of the episode
    – Cherubel
    Feb 4, 2019 at 7:46
  • It's a bit hard to quote since it was a major plot point of S2E3.
    – Stephen
    Feb 5, 2019 at 1:17
  • 1
    It wasn't a "mirror-spore". It was simply a spore. Remember: the mycelial network is between the prime and mirror universes.
    – Pod
    Mar 4, 2019 at 9:48
  • 1
    @Pod It was specifically discussed in the episode that it was a spore from the mirror universe, since all members of the engineering team were inoculated against the spores in the prime universe.
    – Stephen
    Mar 11, 2019 at 0:51

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