Mark the hammerhead shark doesn't have it easy - unless he wears a disguise, waiters won't serve him, and he can't go anywhere without people screaming and running away or teasing him.

Mark the hammerhead shark doesn't have it easy - unless he wears a disguise, waiters won't serve him, and he can't go anywhere without people screaming and running away or teasing him.

But when a little boy befriends him on a cruise ship holiday, he can see something in Mark that everyone else can't… could Mark be a harmless hero?