abstract
| - (archive footage)
* Nilz Baris
* DS9: "Trials and Tribble-ations" (archive footage)
* Arne Darvin
* DS9: "Trials and Tribble-ations" (as his older self and also in archive footage)
* Amanda Grayson (played by Mia Kirshner, originally played by Jane Wyatt)
* DIS: "Lethe"
* Colonel Green (played by Steven Rankin, originally played by Phillip Pine)
* ENT: "Demons"
* Cyrano Jones
* TAS: "More Tribbles, More Troubles"
* DS9: "Trials and Tribble-ations" (archive footage)
* 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:
* "Blood Oath"
*
*
* "The Sword of Kahless"
*
*
* "Once More Unto the Breach"
* Korax
* TAS: "More Tribbles, More Troubles" (voiced by James Doohan, originally played by Michael Pataki)
* Harry Mudd (played by Rainn Wilson, originally played by Roger C. Carmel)
* TAS: "Mudd's Passion"
* DIS:
* "Choose Your Pain"
*
*
* "Magic to Make the Sanest Man Go Mad"
* Stella Mudd (played by Katherine Barrell, originally played by Kay Elliot)
* DIS: "Magic to Make the Sanest Man Go Mad"
* Janice Rand
* VOY: "Flashback"
* Sarek (played by James Frain, originally played by Mark Lenard)
* TAS: "Yesteryear"
* TNG:
* "Sarek"
*
*
* "Unification I"
*
* DIS:
* "The Vulcan Hello"
*
*
* "Battle at the Binary Stars"
*
*
* "Lethe"
* Surak (played by Bruce Gray, originally played by Barry Atwater)
* ENT: "Awakening" (In a Katric vision)
* T'Pau (played by Kara Zediker and an uncredited Betty Matsushita, originally played by Celia Lovsky)
* VOY: "Darkling" (hologram)
* ENT:
* "Awakening"
*
*
* "Kir'Shara"
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