Pilot you really wished it became a series

[Bakuma1997]

Pilot is the basically a prototype for a series, be anime, live action or cartoons, while some succeed, some aren't so lucky, showcase yours
While using the Cartoon preflix, anime and Live action applies

Mine must go to this one, especially in a age that ensued the only thing that changed was the shape of the phones

 

[Guinea]

One of the most OP DC characters never got his own show and that still makes me sad:

Edit- Oh, and while this show never even had a pilot episode, and is currently in limbo with no hope to ever being made, I'm sad that the Final Fantasy 9 anime never came to be. It was going to be called Final Fantasy IX: The Black Mages' Legacy, which featured Vivi's children growing up and saving the world. I hate Square Enix sometimes.

 

[X y b e r - S k u ll]

Kind of cheating here since this is only a teaser technically, but man I would've loved to see something like this when I was a kid:

This is a project Daisuke Nakayama, a Japanese artist/animator/director, has had floating around for almost 20 years now. I have no idea what has been preventing this from getting off the ground after all this time, but he does appear to still have interest in the project and still draws characters from it so hopefully my man can finally have his day and get this thing out there in some way.

 

[bjork]

The US Sailor Moon, out of morbid curiosity more than anything