Below you can find the This underworld kingpin had a helmet that made him invisible; after all his name means the unseen Jeopardy Words Answer. The answer to This underworld kingpin had a helmet that made him invisible; after all his name means the unseen has 5 letters. This clue belongs to the It's greek mythology to me category and is part of Jeopardy Word Level 718. If you scroll near the bottom you will find other clues and answers part of level 718