Pat Sullivan was a groundbreaking Australian-American cartoonist and film producer whose work in the silent film era laid the foundation for animation as we know it today. His most notable achievement is the creation of the beloved character Felix the Cat, with iconic titles such as *Felix Comes Back* (1922) and *Felix the Cat Hunts the Hunter* (1926) that remain highly sought-after by collectors. Sullivan’s productions captured the whimsical spirit of the Roaring Twenties and introduced innovative animation techniques that influenced future generations. Collectors are particularly drawn to Sullivan's work not just for its historical significance, but for the charm and creativity of the Felix series. Films like *Felix Trifles with Time* (1925) and *Felix Switches Witches* (1927) showcase his ability to blend humor with imaginative storytelling, making them classic additions to any collection. As a pioneer in the field, Sullivan's contributions to animation continue to resonate, ensuring that his films remain treasured artifacts in the world of physical media.