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Memory Alpha

Karl Four was the son of Karla Five and the grandson of her father.

He had a laboratory on his homeworld Arret which was used by the crew of the USS Enterprise in 2270 to locate two corresponding supernovae that occur in both his antimatter universe and the Enterprise crew's positive matter universe. (TAS: "The Counter-Clock Incident")

The voice for Karl Four was provided by James Doohan.
Bob Kline based Karl Four's appearance on Les Tremayne's character, Mentor, from Shazam!, a live-action series also produced by Filmation. (Star Trek: The Official Guide to the Animated Series, p. 150)

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