There was originally going to be a New Year's Eve Episode of Pokémon. It was never shown, not even in Japan due to this episode. This episode also caused the Japanese version of the show to go on hiatus. Also because of this episode, Porygon has never been seen in the anime after this episode except for a small cameo in the opening sequences of the first five movies. Porygon's evolutions have not been featured in the anime as well.