Howard Michael Mandel is a Canadian comedian, television personality, actor, and producer. Mandel is known for voicing Gizmo in the 1984 film Gremlins and the 1990 sequel Gremlins 2: The New Batch, playing rowdy ER resident Dr. From Wikipedia
The duo’s Season 20 audition featured knife-juggling stunts with jackets that secured Mel B’s Golden Buzzer to advance them to the live shows.