Irwin Allen Wiki

A giant scientist abducts some of the little people and begins making clones of them. After the duplicates of Valerie and Barry sabotage the ship and try to kill the others, Steve, Mark and Dan try to rescue the originals who are being held in a lab. The near-perfect clones have a flaw however, as they become violent and then die within hours of being created. They can also be identified by dark spots on their skin, but Dan still realizes he is his clone even though the spots are invisible on his dark skin, and helps the originals.