Characters in Star Trek Adventures - Trek to Madworld

James T. Kirk

Also in Captain's Peril, Star Trek, Star Trek - Mirror Universe - Spectre, Star Trek - The Eugenics Wars - The Rise and Fall of Khan Noonien Singh, Star Trek - The Prometheus Design, Killing Time, Star Trek Myriad Universes - Echoes and Refractions, Star Trek - Time for Yesterday, Avenger, Preserver

Leonard McCoy

Also in Killing Time, Star Trek - Time for Yesterday, Star Trek 6, Star Trek Adventures - Death's Angel, Star Trek Adventures - The Price of The Phoenix, Star Trek 12, Uhura's Song, Prime Directive, Enterprise

Mr. Spock

Also in Harlan Ellison's The city on the edge of forever (teleplay), Star Trek, Star Trek: Strange New Worlds: The High Country, Star Trek - The Eugenics Wars - The Rise and Fall of Khan Noonien Singh, Star Trek - The Prometheus Design, Star Trek - Vulcan's Soul - Exodus, I Am Spock, Imzadi, Killing Time, Star Trek Myriad Universes - Echoes and Refractions

Enowil

Klingons

Also in Star Trek Vanguard - Summon the Thunder, Star Trek - Sand and Stars