Episode 1
Episode: 1x01 | Airdate: Apr 20, 1970
Season 1
Episode 2
Episode: 1x02 | Airdate: Apr 27, 1970
Episode 3
Episode: 1x03 | Airdate: May 4, 1970
Episode 4
Episode: 1x04 | Airdate: May 11, 1970
Episode 5
Episode: 1x05 | Airdate: May 18, 1970
Episode 6
Episode: 1x06 | Airdate: May 25, 1970
Season 2
Episode 1
Episode: 2x01 | Airdate: Sep 14, 1970
Episode 2
Episode: 2x02 | Airdate: Sep 21, 1970
Episode 3
Episode: 2x03 | Airdate: Sep 28, 1970
Episode 4
Episode: 2x04 | Airdate: Oct 5, 1970
Episode 5
Episode: 2x05 | Airdate: Oct 12, 1970
Episode 6
Episode: 2x06 | Airdate: Oct 19, 1970
Episode 7
Episode: 2x07 | Airdate: Oct 26, 1970
Season 3
Episode 1
Episode: 3x01 | Airdate: Mar 15, 1971
Episode 2
Episode: 3x02 | Airdate: Mar 22, 1971
Episode 3
Episode: 3x03 | Airdate: Mar 29, 1971
Episode 4
Episode: 3x04 | Airdate: Apr 5, 1971
Episode 5
Episode: 3x05 | Airdate: Apr 12, 1971
Episode 6
Episode: 3x06 | Airdate: Apr 19, 1971
Episode 7
Episode: 3x07 | Airdate: Apr 26, 1971
Season 4
Episode 1
Episode: 4x01 | Airdate: Aug 26, 1971
Episode 2
Episode: 4x02 | Airdate: Sep 2, 1971
Episode 3
Episode: 4x03 | Airdate: Sep 9, 1971
Episode 4
Episode: 4x04 | Airdate: Sep 16, 1971
Episode 5
Episode: 4x05 | Airdate: Sep 23, 1971
Episode 6
Episode: 4x06 | Airdate: Sep 30, 1971
Specials
Christmas Special
Episode: S04 Special | Airdate: Dec 27, 1971