watch 01:38 The Loop (TV) Do you like this video? This needs a stretch. (Feel free to remove when satisfied of completion.)Needed: History. The Opera House is located in Seattle, Washington. History Scooby-Doo (DC Comics) Insert details here. Appearances Scooby-Doo (DC Comics) #128(a). Ghouls Night at the Opera Retrieved from "https://scoobydoo.fandom.com/wiki/Seattle_Opera_House?oldid=364371" Categories: Articles needing expansion Businesses Scooby-Doo (DC Comics) locations Community content is available under CC-BY-SA unless otherwise noted.