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The Alternative Factor

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"The Alternative Factor" was the 20th episode of Star Trek: The Original Series, in the show's first season, first aired on 30 March 1967. The episode was written by Don Ingalls, directed by Gerd Oswald and novelized in Star Trek 10 by James Blish.


Investigating a "winking out" of the universe, the Enterprise finds a time traveler named Lazarus who has counterparts in both the positive and antimatter universes. If both versions of Lazarus meet at the same time—outside of a magnetic corridor between universes—it will mean the end of everything!

Log entriesEdit

Captain's log, stardate 3087.6 
While investigating an uncharted planet, the Enterprise, and at least this entire quadrant of space, has been subjected to violent, unexplained stress and force. Sensors have reported the presence of a Human being on the planet below who might be connected with the phenomenon. With my first officer and a security team, I have set out in search of him.
Captain's log, stardate 3088.3 
We continue to orbit the dead planet, which seems to be the source of the phenomenon which has struck the Enterprise, and all sections of the galaxy, once again. As for Lazarus, the story he tells me about the humanoid continues to trouble me.
Captain's log, stardate 3088.7 
We are no closer to finding an answer to the strange phenomenon than we were at the beginning. Not only have two of my crewmen been attacked, two of our dilithium crystals are missing, and without them, the Enterprise cannot operate at full power. They must be found.



BarstowClifford BrentBill HadleyHarrisonJames T. KirkLazarusRyan LeslieCharlene MastersLeonard McCoySpockNyota UhuraUSS Enterprise (NCC-1701) personnel (unnamed USS Enterprise (NCC-1701) personnel)

Starships and vehiclesEdit

USS Enterprise (Constitution-class heavy cruiserLazarus' spaceship)


Lazarus's planet (unnamed Alpha and Beta Quadrant planets, the galaxy's Alpha or Beta Quadrant)
Referenced only 
EarthStarbase 200

Shipboard areasEdit

USS Enterprise 
bridgebriefing roomcartographic section (referenced)dilithium reamplificationcorridorengineeringmain engineeringquarterssickbay

Races and culturesEdit


Technology and weaponsEdit


States and organizationsEdit

FederationStarfleet (Starfleet Commandcommand divisionoperations divisionsciences division)

Technology and weaponsEdit

computer bankexperimentation chamberexplosivesmagnetic communication satellitephaserphaser banksafety valvesensorsspaceshipstarshipviewscreen

Materials and substancesEdit

antimatteratmospherecoffeebloodcrystaldilithiumdilithium crystalhydrogenirongasoxygensilicon

Ranks and titlesEdit

captaincommandercommodorecommanding officercommunications officercrewmandoctorengineerFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerlieutenantlieutenant commandermedicofficerphysicianscientistsecuritysecurity teamscience officer

Other referencesEdit

abrasionalternative warpanatomyantimatter universearmbandagebattle stationsbeamblindness • "Bones" • bootbruisebullcaptain's logclothingCode Factor 1deafdevildilithium reamplificationdimensiondimensional doordinosaurdizzinesselectromagnetismenergizer/energizing circuitsenergyFahrenheitFederation membersfive-year missionfootprintforeheadgalaxygeneral alertgovernmentgravimetric fieldheavenHellhomeworldhumanoidlanding partylanguagelife surveylifeformlog entrylogicmagnetic corridormagnetic effectmagnetic fieldmagnetismmattermedicinememorymultiversemusclemannation-statenegative magnetic corridororbitouncepantsparallel universeparanoiaparsecphotographic sectionplanetpoetrypowder kegpositive universepriority oneprisonpulsation phenomenonquadrantraces and culturesradiationrankrecuperative powersred 2 messagerip in the universesciencespacestandard orbitstarstar chartstardateStarfleet General Orders and RegulationsStarfleet uniformStarfleet uniform (2260s)technologytimetime chambertime shiptime traveltitletunicuniformuniversewaterweaponzero gravity


years prior to 2267 
Lazarus crosses over and encounters his double. (prior to episode/novelization)
stardate 3087.6, 2267 (2260s chronology, 2264–2270 Enterprise voyages
Enterprise travels to Lazarus's planet.


Related storiesEdit


Video releasesEdit


published order
Previous episode:
TOS episode produced Next episode:
Tomorrow is Yesterday
Previous episode:
Errand of Mercy
TOS episode aired Next episode:
The City on the Edge of Forever
Previous story:
first story
Star Trek 10
Next story:
The Empath
chronological order
Previous Adventure:
A Vulcan, A Klingon, and an Angel (backstory)
Pocket Next Adventure:
Tomorrow is Yesterday
Previous Adventure:
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Tomorrow is Yesterday

External linkEdit

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