Matt Ottosen at https://www.flickr.com/photos/matthewphx/ · CC BY-SA 3.0

Howie Mandel voiced Gizmo in the Gremlins films and played the rowdy Dr. Wayne Fiscus on St. Elsewhere before building a second career as a game show and competition host — Deal or No Deal and, since 2010, a judge's seat on America's Got Talent.