Leader appears in 4 episodes in this series.
A Titan Rides the Train!; The Horde of Humanoids!; On the Rampage!
September 21, 1966
Micro-Monsters; The Lair of the Leader; To Live Again
October 5, 1966
Brawn Against Brain; Captured At Last!; Enter the Chameleon!
October 12, 1966
Within THE MONSTER Dwells A MAN!; Another World, Another Foe; The Wisdom of the Watcher
October 19, 1966
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