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Lost in Space: The Anti-Matter Man

Episode ??? | Season Unknown  (1965-1968)
(Airdate Dec 27, 1967)

When an experiment in atomization goes awry, John (Guy Williams) is thrust into a bizarre antimatter world, festooned with orange grass and polka dot leaves--and the home of John's own evil lookalike. While his villainous doppelganger takes his place at the Robinson camp, the "real" John is closely guarded by "Drun", the nasty antimatter twin of Don West (Mark Goddard), and by an evil clone of the Robot. It is up to the genuine Robot, with the help of Will (Billy Mumy) and the hindrance of Dr. Smith (Jonathan Harris), to set things right. ~ Hal Erickson, All Movie Guide