The dub for the death screams of the Slayers was taken from the Mayar shrieks in At the Earth's Core.
[?] Frank Price, then-president of Columbia Pictures, determined that an unknown American actress would help state side ticket sales as opposed to an unknown English actress. With that logic in mind, Price met with Lysette Anthony and informed her that all of her dialogue had been dubbed by actress Lindsay Crouse. Anthony was totally unaware that her voice was to be dubbed prior to the meeting.