Are there any lost tv shows(mainly sci fi, fantasy, cartoons

If they were completely lost, we wouldn't be aware they existed.

The only thing I can think of is Classic Doctor Who and that thing was aired it's just some seasons feel completely lost because of audio only episodes or nothing surviving out of it. 

I can name a few cartoons like that:
Tifou: A few images exist of this French cartoon from the 90s, but only the intro has surfaced.
Cory, the Son of Sorcerer: 1993 Korean animated series. Only images survive of this one.
The Fantastic: An early 90s cartoon that is only known to have aired in Israel, & only the intro has surfaced.
Primo le Savant: A French cartoon from 1979, with only one image known to have surfaced, suggesting that it might be claymation?
Doubutsu-Mura Mongotari: 1970 Japanese cartoon(well, anime for the short term) that only survives through images.
Pinch to Punch: Few images exist of this anime, & they're all in black-and-white.
Satellite City: late 80s-early 90s British cartoon with only the intro, a couple of images, & a little bit of extra footage surviving.
Los Pata de Palo: An animated series from Panama, & it hasn't even been confirmed to exist, or at least I can't find anything about this online.