Template:Realworld The following is a list of character appearances in another of the series.
Star Trek: The Original Series
- James T. Kirk
- Star Trek Generations
- DS9: "Trials and Tribble-ations" (archive footage)
- ENT: "These Are the Voyages..." (archive voice only)
- Spock
- TNG:
- DS9: "Trials and Tribble-ations" (archive footage)
- Leonard McCoy
- TNG: "Encounter at Farpoint"
- DS9: "Trials and Tribble-ations" (archive footage)
- Montgomery Scott
- TNG: "Relics"
- Star Trek Generations
- DS9: "Trials and Tribble-ations" (archive footage)
- Pavel Chekov
- Star Trek Generations
- DS9: "Trials and Tribble-ations" (archive footage)
- Uhura
- DS9: "Trials and Tribble-ations" (archive footage)
- Zefram Cochrane (played by James Cromwell, originally played by Glenn Corbett)
- Star Trek: First Contact
- ENT:
- "Broken Bow"
- "In a Mirror, Darkly" (archive footage)
- Arne Darvin
- DS9: "Trials and Tribble-ations" (also archive footage)
- Colonel Green (played by Steven Rankin, originally played by Phillip Pine)
- Kahless the Unforgettable (played by Kevin Conway, originally played by Robert Herron)
- TNG: "Rightful Heir" (as his clone)
- Kang
- DS9: "Blood Oath"
- VOY: "Flashback"
- Koloth
- TAS: "More Tribbles, More Troubles" (voiced by James Doohan, originally played by William Campbell)
- DS9: "Blood Oath"
- Kor
- TAS: "The Time Trap" (voiced by James Doohan, originally played by John Colicos)
- DS9:
- Korax
- TAS: "More Tribbles, More Troubles" (voiced by David Gerrold, originally played by Michael Pataki)
- Sarek
- TAS: "Yesteryear"
- TNG:
- "Sarek"
- "Unification I"
- Surak (played by Bruce Gray, originally played by Barry Atwater)
- T'Pau (played by Kara Zediker and an uncredited Betty Matsushita, originally played by Celia Lovsky)
Star Trek: The Next Generation
- Jean-Luc Picard
- DS9: "Emissary"
- ENT: "These Are the Voyages..." (archive voice only)
- Data
- ENT: "These Are the Voyages..." (voice only)
- Reginald Barclay
- VOY:
- "Projections" (holographic image)
- "Pathfinder"
- "Life Line"
- "Inside Man"
- "Author, Author"
- "Endgame"
- VOY:
- Boothby
- VOY:
- "The Fight" (in Chakotay's hallucination and a hologram)
- "In the Flesh" (Species 8472 in disguise)
- VOY:
- Borg Queen
- VOY:
- "Dark Frontier" (played by Susanna Thompson, originally played by Alice Krige)
- "Unimatrix Zero" (played by Susanna Thompson)
- "Unimatrix Zero, Part II" (played by Susanna Thompson)
- "Endgame" (played by Alice Krige)
- VOY:
- Kol
- VOY: "False Profits" (played by Leslie Jordan, originally played by an uncredited J.R. Quinonez)
- Kurn
- DS9: "Sons of Mogh"
- Alynna Nechayev
- DS9:
- "The Maquis, Part II"
- "The Search, Part II" (virtual)
- DS9:
- Neral
- DS9: "Inter Arma Enim Silent Leges" (played by Hal Landon, Jr., originally played by Norman Large)
- Keiko O'Brien
- DS9:
- "A Man Alone"
- "If Wishes Were Horses"
- "In the Hands of the Prophets"
- "The Siege"
- "Cardassians"
- "Rivals"
- "Armageddon Game"
- "Whispers"
- "Tribunal"
- "The House of Quark"
- "Fascination"
- "Accession"
- "Hard Time"
- "Body Parts"
- "Looking for par'Mach in All the Wrong Places"
- "The Assignment"
- "The Begotten"
- "Time's Orphan"
- "What You Leave Behind"
- DS9:
- Miles O'Brien
- DS9: series regular
- Q
- DS9: "Q-Less"
- VOY:
- "Death Wish"
- "The Q and the Grey"
- "Q2"
- Alexander Rozhenko
- DS9:
- "The Way of the Warrior" (picture only)
- "Sons and Daughters" (played by Marc Worden, originally played by Jon Steuer and Brian Bonsall)
- "You Are Cordially Invited" (played by Marc Worden)
- DS9:
Star Trek: Deep Space Nine
- Broik
- TNG: "Birthright, Part I"
- VOY: "Caretaker"
- Morn
- TNG: "Birthright, Part I"
- VOY: "Caretaker"
Star Trek: Voyager
- EMH
- DS9: "Doctor Bashir, I Presume" (as Deep Space 9 EMH)
- Star Trek: First Contact (as USS Enterprise-E EMH)