Check out the Lost Media Wiki’s article on the Jelly Jamm pitch pilot!!!!!!
Jelly Jamm is a children's animated television series from Spain and United Kingdom created by Carlos L. Rey, Victor M. López and David Cantolla, in 2009, a pilot was made by Rafa Carmona before the show came out in 2011, and its currently partially lost, so far, only a few images has been found, according to a website, Carlos Vermut made the character designs for the pilot.
On 9 of June 2021, Fractius found more images and some clips of the Pilot Episode.
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29/6/2021: Hello. While searching for a Bello plush, i found a weird image of Pilot Mina with a very elongated leg.