The young littluns first created the beast in their nightmares as a result of their conditions on the deserted island, explaining it as a snake-like creature that comes from the sea.
Ralph encourages the others boys to do their part on being rescued, assigning the twins Sam and Eric to watch the signal fire. As they are maintaining the fire, they notice something gliding to the ground, immediately assuming it to be the beast.
As Simon travels to his relaxation zone he stumbles upon the dead pilot, finally realizing the truth about the beast. The sight of the pilot's rotting, decaying flesh causes Simon to throw up. After his adaptation to the corpse's conditions completes he rushes to tell the other boys of his findings.