when was the last year that is the same upside down
Upside down year The most recent upside down year was 1961, and before that where sequentially 1881 and 1691.
Captain Underpants September 1, 1997 - August 25, 2015 (main series)
Fist of the Blue Sky On October 24, 2017, it was announced that
The Adventures of Pete & Pete Little Pete Wrigley (Danny Tamberelli)