 He had developed a different version of his performance specifically for the semi-finals, in which he also exchanges voices with his puppets and simulates echos, but didn't get enough audience votes to advance to the finals.In February 2007, Kevin appeared on the Late Show with David Letterman for the show's second "Ventriloquist Week".Starting in 2008, Johnson has started doing shows on board the Disney Cruise Line ship, "The Disney Magic."