Some time before the events of the series, Ford came across the Island Head Beast, recording its appearance in Journal 3. Tate McGucket also had some knowledge of the creature, warning those who asked to flee if they saw bubbles near the island.
In "Tooth," Dipper and Mabel set out to find the creature after finding its tooth on the shore. Later that night, the twins notice bubbles in the water near a small island. The ground starts to shake, and the twins begin to row away. As they do this, the island floats out of the water, revealing it to be a giant floating head. The camera shuts off as the head approaches the rowboat. Later, the camera is found on the beach. Dipper says the giant head thing sunk back into the lake after it attacked them, but lost another tooth trying to eat their boat.
It usually sits beneath the water, and appears to be an island with pine trees on it, but when it levitates it looks like a giant humanoid head with glowing eyes and roots dangling from the bottom. It also appears to be missing a tooth. It also has a human skeleton on its bottom.
- 5. "Tooth"
- When played backwards, it says something along the lines of "You have awoken me from my slumber! Enter my mouth, children! Enter your destiny! RAAAHH!"
- The island head resembles Zanthar, who is also a large being covered with trees, and who happens to be headless.
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