Pearl is a mermaid living off the coast of Serenia. She was a friend of the Ancient Mariner, although she did not speak the Common language. Fortunately, she was able to understand it when it was spoken to her. After Graham met the Ancient Mariner, he summoned Pearl from the nearby waters with a whistle. Then, he instructed her to lead Graham and Cedric the Owl to Mordack's Island. She complied, but vanished into the ocean once they drew near to the isle.
Pearl appears in King's Quest V: Absence Makes the Heart Go Yonder.