Some information about Uchujin Pipi.

Uchujin Pipi actually aired for about 51 episodes not 52, Additionally a year after uchujin pipi Ended. It was revived for 3 two-parter episodes, The survival status to the revival series are unknown but likely entirely missing https://www.nhk.or.jp/archives/chronicle/search/?keyword=宇宙人ピピ&page=1&rec_count=50