Fred Krone

Tony says he wished he lived in the old days, so Jeannie blinks him back there.

Jeannie sends a double of Tony to a conference; The other Tony goes to France.

As if Dr. Smith isn't odd enough to begin with, an unusual creature takes over his personality. Coincidentally, the Robinsons begin to disappear from the ship one by one.

John Robinson is accidentally transported to an anti-matter world, where he is held captive by an evil replica of Don. Meanwhile, an "evil" John Robinson shows up at the Jupiter 2 and poses as the real John.