Pororo takes a shortcut during a sled race with his friends and he ends up getting lost. He wanders around and finds a cave in the forest where he hears a strange sound. Scared, Pororo runs into his friends and tells them he thinks there’s a monster in the cave. However, his friends don’t believe him, call him a scaredy-cat, and compare him to brave Petty. Pororo says he’s not a scaredy-cat and challenges Petty to a contest of courage. Spurred to win, Petty and Pororo claim they are more courageous than the other and they head off to the cave where the strange sound was heard.