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"That Which Survives" was the 69th episode of Star Trek: The Original Series, the 14th episode of the show's third and final season, first aired on 24 January 1969. The episode was written by Michael Richards and John Meredyth Lucas, directed by Herb Wallerstein and novelized in Star Trek 9 by James Blish.



Episode characters

Robert D'AmatoBill HadleyJames T. KirkRoger LemliLosiraLosira (hologram)Jabilo M'BengaLeonard McCoyManjula RahdaIgnacio SanchezMontgomery ScottSpockHikaru SuluNyota UhuraVinci[1]John B. WatkinsWyattUSS Enterprise computer

Novelization characters

Robert D'AmatoJames T. KirkLosiraLosira (hologram)Jabilo M'BengaLeonard McCoyRadhaMontgomery ScottSpockHikaru SuluNyota UhuraJohn B. WatkinsWyatt
Referenced only
Ignacio Sanchez

Starships and vehicles

USS Enterprise (Constitution-class heavy cruiser)

Races and cultures


Technology and weapons


Materials and substances


States and organizations


Ranks and titles

captaincommandercommanding officercommunications officerFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerlieutenant commanderofficerscientistscience officer

Other references

anatomyarmbootclothingFederation membersfingerfive-year missiongovernmenthumanoidlanguagelifeformlogicmattermemorynation-stateorbitpantsquadrantraces and culturesrankspacestarstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformuniverseweapon


Related media

  • TOS - Gateways novel: One Small Step
    • The final scene of the episode is novelized in the beginning of this book. Lemli is called "Joe Reinhart" and the computer simulation of Losira is reactivated in the novel.


Video releases


This episode had no stardate, but the ST reference: Mr. Scott's Guide to the Enterprise assigned events from this episode the date of 5978.2.



published order
Previous episode:
Wink of an Eye
TOS episode produced Next episode:
Let That Be Your Last Battlefield
Previous episode:
The Mark of Gideon
TOS episode aired Next episode:
The Lights of Zetar
Previous story:
The Ultimate Computer
Star Trek 9
Next story:
chronological order
Previous Adventure:
The Hunting
Pocket Next Adventure:
Section 31: Cloak
Previous Adventure:
Wink of an Eye
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Gateways: One Small Step

External links

  1. This character was not named in the episode but the same actor, wearing the same operations division Starfleet uniform, was addressed as Vinci in TOS episode: "The Devil in the Dark". The same actor also played the character of Clifford Brent.