Professor Genius first appeared as "Dr. Pill" in Winsor McCay's *Little Nemo in Slumberland* comic strip, possessing a distinct personality and appearance from later versions. Across official media, his core role persists as King Morpheus's chief advisor and right-hand man. He shoulders responsibilities for Princess Camille's well-being and maintaining Slumberland's orderly affairs. In the 1992 animated film *Little Nemo: Adventures in Slumberland*, Professor Genius transports the young protagonist Nemo to Slumberland via dirigible. He successfully delivers Nemo to King Morpheus and introduces him to Princess Camille, later escorting Nemo to mandatory prince lessons which Nemo dislikes. When the forbidden door opens, releasing the Nightmare King and capturing King Morpheus, Professor Genius reassures Nemo and shifts to a supportive role. He joins Nemo's rescue mission, emphasizing collective responsibility despite initially blaming the clown Flip. His personality combines sophistication, punctuality, and a strong preference for order. He demonstrates unwavering loyalty to Slumberland's monarchy and shows compassion towards Nemo during the quest, though he exhibits moments of cowardice when confronting threats. In the film's real-world sequences, he mirrors his Slumberland role as an organist in a traveling circus parade. Professor Genius makes minor appearances in video game adaptations. He is absent from *Little Nemo: The Dream Master* but features in the opening and ending scenes of the arcade game *Nemo*. He lacks significant presence or details in spin-offs, OVAs, or alternate seasons beyond these appearances. The character receives no explicit development or backstory expansion across verified sources. His role remains ancillary, focused on facilitating the protagonist's journey and upholding Slumberland's stability without evolving beyond his established traits.