Cartoon network series Unikitty! (A spinoff of The Lego Movie) has three seasons. But only season one is available for purchase on dvd. In America you can stream the show on Hulu for no extra charge. And you can buy the whole show on Apple TV and YouTube. But DVD's of seasons one and two have yet to surface at the time of this writing. This limits the show for people who wish to own it physically or check it out from libraries. It could also result in episodes becoming lost if streaming sites remove it from their platforms. Due to its obscurity (and the show ending in 2020) this is likely.