The Hell Valley Sky Trees are three creepy figures that reside on Hell Valley at the Shiverburn Galaxy. They watch anyone below in a creepy manner. After Mario, SMG4, and Woody arrive here to save their friends who are on a rock platform surrounded by lava by freezing the plant over, The Monster arrives and reveals that The Hell Valley Sky Trees are its second cousins. He sends them down to finish off Mario, SMG4, and Woody. They attack by using fire and their laser eyes. Despite this, Mario, SMG4, and Woody managed to beat them thus turning them to stone and returning them to Hell Valley. A relative of them is encountered in the Super Mario 3D Land Longplay.