A stowaway travels illegally on a ship or airplane, to avoid paying the fare and/or to smuggle him- or herself into or out of a country.
Sometimes the stowaway stays hidden during the whole journey, sometimes only until the vehicle can not return.
Sometimes a stowaway dies due to lack of food, water or oxygen, due to cold, or by falling out of a plane when the landing gear is engaged.
There are three films named Stowaway.