1st
season (episodes
1-32, September 17, 1965 to April 29, 1966)
2nd
season (episodes
33-62, September 16, 1966 to April 7, 1967)
3rd
season (episodes
63-92, September 9, 1967 to March 30, 1968)
4th
season (episodes
93-118, September 28, 1968 to March 22, 1969)
5th
season (episodes
119-144, September 26, 1969 to March 27, 1970)
6th
season (episodes
145-168, September 20, 1970 to April 4, 1971)