March 06, 1972 Season 1 96 Episodes How to watch?:Please click on the Season List, then select an episode. Wait for the video to load—usually, it doesn't take long! January 01, 1973 Season 2 118 Episodes How to watch?:Please click on the Season List, then select an episode. Wait for the video to load—usually, it doesn't take long! January 07, 1974 Season 3 104 Episodes How to watch?:Please click on the Season List, then select an episode. Wait for the video to load—usually, it doesn't take long! January 02, 1975 Season 4 3 Episodes How to watch?:Please click on the Season List, then select an episode. Wait for the video to load—usually, it doesn't take long!