The Roc is a mythological giant bird with two heads whose eggshells are ingredients to the potion to restore Princess Parissa to her normal size. They are so big, they can blot out the sun with their wings. The hatchling were attacked and cooked by Sinbad's crew. When Sinbad tried to retrieve the eggshell, the roc saw the broken egg with no hatchling and attacked and left him unsconcious and left Sinbad in his nest. Sinbad escaped.