- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
Planet: name unspecified. This spacefaring humanoid species desired to be isolated in 2366 at first contact with the UFP, as some of its natives were undergoing metamorphosis into noncorporeal creatures. Within four years, at least some natives were involved with the Maquis on Volan III. Among their technology, Zalkonians have developed a projectable paralysis field that can strangle the crews of nearby vessels.