Age: 48

Hometown: London, England

Marc Spelmann appeared on "Britain's Got Talent" Season 12 with a heart-wrenching magical performance dedicated to his wife and daughter. His audition went viral with millions of views around the world, but despite being a Golden Buzzer act, he failed to make the Finals. He secretly returned to "Britain's Got Talent" Season 13 as an anonymous character known only as "X" and went on to become the runner-up, revealing his true identity during the finale.