The Nightmare voices take the form of mangled puppets, dolls, action figures, and toys that torment the hero Spark with their eerie warning. They should have high, almost playful sounding voices that increase in insanity and intensity with each line. They might sound whispering, far away, echoed, or static-y, like a recorded voice in a toy. They should all sound female, but male performers speaking in falsetto will work just as well.