Matt Groening: Disenchantment grew out of ideas we couldn't do on The Simpsons

Variety

“I keep sketch books that are full of characters and I started drawing fantastic creatures we couldn’t do on The Simpsons and we just went from there,” Groening said at the TV press tour while promoting his medieval animated series. “I filled up an entire sketch book full of imps and gnomes and trolls and fairies." ALSO: Groening declined to further discuss The Simpsons' Apu controversy at press tour.