An actor in King Koopa costume, Super Mario's arch-nemesis, hosts a children program where he and his pet Ratso play short public domain cartoons and give gift certificates for NES products ... Read allAn actor in King Koopa costume, Super Mario's arch-nemesis, hosts a children program where he and his pet Ratso play short public domain cartoons and give gift certificates for NES products to kids that make up the studio audience.An actor in King Koopa costume, Super Mario's arch-nemesis, hosts a children program where he and his pet Ratso play short public domain cartoons and give gift certificates for NES products to kids that make up the studio audience.