Você está pensando no filme francês Gandahar .
De IMDB :
This animated film is set on the planet Gandahar, where peace reigns and poverty is unknown. The utopian lifestyle is upset by reports of people at the outlying frontiers being turned to stone. Sent to investigate, Prince Sylvain (John Shea) crashes and is rescued by the Deformed, hideous genetic experiments gone wrong and left to fend for themselves. With their help, Sylvain discovers that the Metamorphosis, a gigantic brain also created in an experiment, is trying to destroy Gandahar.This animated film is set on the planet Gandahar, where peace reigns and poverty is unknown. The utopian lifestyle is upset by reports of people at the outlying frontiers being turned to stone. Sent to investigate, Prince Sylvain (John Shea) crashes and is rescued by the Deformed, hideous genetic experiments gone wrong and left to fend for themselves. With their help, Sylvain discovers that the Metamorphosis, a gigantic brain also created in an experiment, is trying to destroy Gandahar.
O cara que você está pensando é um dos Deformed acima mencionado.
