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Memory Alpha
Karl Four

Karl Four in his lab

Karl Four was the son of Karla Five. 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.
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