Cyborg Kuro-chan "Episode 66" (found episode of anime series; early 2000s)
From The Lost Media Wiki
Cyborg Kuro-chan was an anime that ran from October 2nd, 1999 to January 6th, 2001 in Japan. There were a total of 66 episodes created, though episode 66 (the finale) was never seen outside of Japan. The episode aired a few times and no DVDs have been released of Cyborg Kuro-chan, so the 66th episode has not been seen since, and is impossible to find online, unlike the other 65. The only footage of Episode 66 on the entire Internet is in a 30-second sneak preview shown immediately after Episode 65.