Pre-production work revolved around
Brian Froud's designs without a finished script. When Froud originally presented
Jim Henson with concept drawings for the crystal, Henson seemed totally perplexed. When Froud asked why, Henson said he had no idea what the designs were for. As it turned out, Froud had misunderstood Henson during early production conversations - Henson intended the film to be called "The Dark Chrysalis," referring to the Skesis dominance over the world. Henson, however, loved the concept art and integrated the idea of the crystal into the storyline.
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