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Memory Beta, non-canon Star Trek Wiki
For other uses, see Lethe.

Lethe is the sixth episode of Star Trek: Discovery in the program's first season, which premiered on 22 October 2017 exclusively on CBS All Access, written by Joe Menosky and Ted Sullivan and directed by Douglas Aarniokoski.



AiriamMichael BurnhamKatrina CornwellHugh CulberDennasKeyla DetmerAmanda GraysonKol (Commander)Gabriel Lorca (mirror)Joann OwosekunSarekSaruPaul StametsTerralSylvia TillyAsh Tyler (Klingon)UjilliV'LatakCancri elders
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Ellen LandryRauseSpockWebb

Starships and vehicles[]

USS Discovery (Crossfield-class science vessel)
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USS Enterprise (Constitution-class heavy cruiser)


the galaxy's Alpha and Beta Quadrants 
Cancri IV (Cancri system) • Vulcan (Vulcan system, Vulcan sector, Beta Quadrant)
Referenced only 
Grazer (Grazer system) • Yridia (Yridia system) • Yridia Nebula

Races and cultures[]


States and organizations[]

StarfleetUnited Federation of Planets

Science and classification[]

eugenicsmycelial networkspacestarstar systemtechnologytimeuniverseweapon

Technology and weapons[]

sensorspore drivestarship

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Other references[]

atmospherebootclothinggovernmentgreen teajacketnationpantsraces and culturesrankscienceStarfleet uniformStarfleet uniform (2240s-2265)titletranspo drilluniform




Star Trek: Discovery episodes
season 1 chapter 1 "The Vulcan Hello" • "Battle at the Binary Stars" • "Context Is for Kings" • "The Butcher's Knife Cares Not for the Lamb's Cry" • "Choose Your Pain" • "Lethe" • "Magic to Make the Sanest Man Go Mad" • "Si Vis Pacem, Para Bellum" • "Into the Forest I Go"
chapter 2 "Despite Yourself" • "The Wolf Inside" • "Vaulting Ambition" • "What's Past Is Prologue" • "The War Without, The War Within" • "Will You Take My Hand?"
season 2 "Brother" • "New Eden" • "Point of Light" • "An Obol for Charon" • "Saints of Imperfection" • "The Sound of Thunder" • "Light and Shadows" • "If Memory Serves" • "Project Daedalus" • "The Red Angel" • "Perpetual Infinity" • "Through the Valley of Shadows" • "Such Sweet Sorrow"
season 3 "That Hope Is You, Part 1" • "Far From Home" • "People of Earth" • "Forget Me Not" • "Die Trying" • "Scavengers" • "Unification III" • "The Sanctuary" • "Terra Firma" • "Su'Kal" • "There Is A Tide..." • "That Hope Is You, Part 2"
season 4 "Kobayashi Maru" • "Anomaly" • "Choose to Live" • "All Is Possible"


published order
Previous episode:
Choose Your Pain
Discovery episode produced Next episode:
Magic to Make the Sanest Man Go Mad
Previous episode:
Choose Your Pain
Discovery episode aired Next episode:
Magic to Make the Sanest Man Go Mad
chronological order

External link[]