Little Nemo: Adventures in Slumberland was released in American theaters in 1992. However, at one point earlier in its development many people from Studio Ghibli (Spirited Away, My Neighbour Totoro) had been involved with the project. In 1984 they produced this test pilot. 

Alternative pilot made for Little Nemo: Adventures in Slumberland

Welcome to the fantasy world of "Little Nemo," where dreams of enchanted lands and new friends take young Nemo into an exciting, fun-filled adventure through Slumberland. On one unforgettable night, Nemo falls asleep. Soon, with the help of his flying pet squirrel Icarus and his friend Professor Genius, they journey together into Slumberland. Nemo is lovingly embraced by the people of Slumberland, particularly the King, who adopts Nemo and makes him heir to the throne. He is entrusted with two very special possessions: the prized royal Scepter, and a mysterious key that unlocks many secrets! 
 
Though Nemo is warned not to open the one door with the power to destroy Slumberland, temptation proves too strong and the King is abducted as a black cloud of nightmares washes over the formerly idyllic dreamscape. Now, if Nemo is to reverse his error and bring the King back, he must rally his friends and journey deep into Nightmare Land. 
 
(Source: Discotek Media)

Note: Included in the 31/07/2019 Japanese BluRay release

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