January 14, 1974 Season 1 53 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! June 13, 1980 Season 2 12 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! December 24, 1981 Season 3 56 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! March 06, 1989 Season 4 57 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 31, 1994 Season 5 67 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! August 27, 2018 Season 6 40 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!