He had also appeared in multiple films such as "Coneheads", "Kiki's Delivery Service", "Cheech & Chong's Next Movie", "House Guest", "The Pagemaster", "Small Soldiers" and "Jingle All The Way", among many others. Hartman was also a prolific voice actor who had voice roles in several cartoons, such as "Scooby Doo", "The Simpsons", "", "Darkwing Duck" and "The Smurfs".