When Mark Rowe arrives on the island of Baladora with Carolyn Hawlings to meet with his Aunt Benna, instead of being greeted by her, he is instead greeted by Carolyn's brother Dr. Hawlings and his twelve-year-old daughter Kareen. They inform Mark that his aunt has been missing for weeks and that they need the jungle magic that was bestowed on Mark to find her. It is revealed that Mark was bestowed the magic when he was four by Aunt Benna, however Mark has no idea how to call upon it. Mark walks off, only to find a room filled with shrunken heads and Aunt Benna's journal. It reads that Dr. Hawlings and Carolyn are actually evil, and if they were to discover the secret of jungle magic, it could destroy the entire jungle. He ends up running into Kareen, who claims she doesn't know anything about her dad being evil. Mark believes her, but goes off into the jungle to find his Aunt Benna.
After several harrowing incidents in the jungle, he is eventually rescued by Kareen. The two find Aunt Benna, who is horrified to see Mark with Kareen, as it turns out that she was working with her father all along. And due to him saying "Kah-lee-ah" in front of her, she now knows the magic words. However, they can't get the magic to work. They threaten to shrink Mark and Aunt Benna's heads. Mark attempts to use his Shrunken Head on them, but it gets knocked into a pile of shrunken heads. As Aunt Benna fights with Dr. Hawlings, Mark dives into the pile, says the magic words, and causes Dr. Hawlings, Carolyn and Kareen to shrink to the size of mice and run off into the jungle, never to be seen again. In the television adaptation, the villains are still shrunk, but Mark manages to catch them and keep them in a lizard tank in his room where he takes care of them and the spell will be removed when Aunt Benna comes only until his sixteenth birthday.
Dr. Hawlings is described as having white hair and pale blue eyes, wearing a white lab coat. Mark mistakes him for his aunt at first glance.
Dr. Hawlings is written to be rather nice and unassuming until Mark discovers his true evil intentions. He is also quite impatient, pressuring Mark to reveal the jungle magic.