Star Trek: The Original Series: Vol. 1.4

WHAT ARE LITTLE GIRLS MADE OF? Stardate: 2712.4 The acclaimed medic, Dr Roger Korby, has been lost for five years on the planet Exo III. Attempting determine his fate, the crew of te U.S.S. Enterprise discover that he is living in tunnels, beneath the frozen surface. Korby has made a staggering discovery which could have universal repercussions... US AIRDATE: 20.10.1966 DAGGER OF THE MIND Stardate: 2715.1 While the U.S.S. Enterprise is delivering supplies to the Tantalus penal colony, an inmate manages to smuggle himself aboard. Seemingly deranged, he demands asylum, pleading with Kirk not to send him back. To investigate the cause of the man's distress, the captain beams down... US AIRDATE: 3.11.1966 MIRI Stardate: 2713.5 Investigating an antiquated S.O.S. signal, the crew of the U.S.S. Enterprise are astonished to discover an exact duplicate of the planet Earth, in an alien star system. Beaming down to the surface, the landing party discover that the planet is populated by immensely old children... US AIRDATE: 27.10.1966