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Duplicates of John and Don, prisoners of a shadow world, plot their escape. As John uses an atomizing unit to investigate engine repairs, they sense their chance. The evil copy of John breaks through and drags the real John back to his own dark world! He plans to make the switch permanent, unless Will and the Robot can stop him!
The "evil" robot did not wear clothes, of course, but it was painted in a scheme similar to the clothing worn by the evil duplicates. One might presume this is some sort of prison uniform. The evil robot's chest light was green, which is the "opposite" color (in color film negatives) to the real robot's red flashing chest light.