Jemmy is the prince's fiercely devoted pet cat. His loyalty to his owner clashes sharply with his antagonism towards Marina, fueled entirely by jealousy over her growing bond with the prince. This possessiveness drives Jemmy's calculated efforts to remove Marina from the prince's life. His first attempt involves direct physical harm: he deliberately spooks Marina's horse during a ride, causing her to be thrown and pursued by wolves. When this fails, Jemmy schemes politically. He reports the prince's affection for Marina to the king and queen, manipulatively framing the prince's stated preference for Marina over his arranged marriage as evidence of Marina bewitching him. This report directly prompts the royal parents to imprison Marina and hasten the prince's marriage to the Princess of Suomi. Jemmy acts solely to preserve his exclusive closeness to the prince, viewing Marina as a critical threat. His interventions are instrumental in orchestrating the circumstances leading to Marina's tragic fate, establishing him as a significant source of conflict within the human palace narrative.