with 7 episodes premiered on Invalid Date

with 26 episodes premiered on January 7, 1961

"Girl on the Trapeze," "The Frighteners," "Tunnel of Fear" and the first act of "Hot Snow" are the episodes known to exist of the first series.

with 26 episodes premiered on September 29, 1962

with 26 episodes premiered on September 28, 1963

with 26 episodes premiered on October 2, 1965

with 24 episodes premiered on January 14, 1967

with 33 episodes premiered on September 25, 1968