Maltz

Maltz was a supporting villain in the third Star Trek film, Star Trek III: The Search for Spock. He was played by John Larroquette.

Biography
Maltz, along with Torg, was a high-ranking Klingon officer serving aboard Commander Kruge's Bird-of-Prey. Unlike many other Klingons, he was very soft-spoken and seemed to appreciate the scientific aspects of Genesis rather than its military applications, despite hailing from a warrior culture. He went with Kruge to the Genesis Planet, and was the only Klingon to survive the events that took place there. When Kruge beamed down to the planet's surface to fight Kirk, he ordered Maltz to beam the capture Enterprise crew up to the Klingon ship. After Kirk defeated Kruge, he imitated the order to beam up using a Klingon commincator. When Kirg, along with Spock, was beamed aboard, he found Maltz holding Scotty, McCoy, Sulu and Chekhov at gunpoint, and Maltz, realizing he was outnumbered and that his leader was dead, surrendered, telling Kirk he didn't deserve to live. Although Kirk told Maltz he'd kill him, he instead had him locked up.