This is the Ladd Ehlinger JR version of Flatland, which stays accurate to the book:
Flatland A Romance of Many Dimensions (Edwin A. Abbott).
It was first published in 1884 under the pseudonym A. Square.
While the book is better, the video is fairly good.
(This is for C M H, of Virginia Edu, from Tony.)
By the way, The middle initial is for Abbott. I guess the parents were having a bit of fun!