The windy city is home to the hit TV show, Talent Star, in which songwriting duoFred Jones and Daphne Blake are finalists with some high hopes. Not to be left out, Scooby-Doo and Shaggy Rogers have a secret act in the works, which they are betting will take the contest by storm. Unlucky for them, the competition is frightful at this talent contest as the show is being broadcast from an opera house with a history of horrors and a particularly vengeful phantom that has cursed the show's production. From costume changin' chases to collecting creepy clues, the show must go on.
During a stormy night, the stage of a former opera house in Chicago is being set for the Talent Star finalists. Germ-o-phobic assistant director, Dewey Ottoman, is bossing people around and cleaning up around after them as they work when suddenly a phantom appears and attacks. He steals Dewey's clipboard and causes an explosion. Dewey's assistant finds the clipboard, which has "CHRISTINE MUST WIN!" written on it.
The film combines elements of both America's Got Talent, (and other similar talent shows), and Gaston Leroux's 1911 novel The Phantom of the Opera, as well as its film and musical adaptations.
Notable references to The Phantom of the Opera include:
A "Phantom" terrorizes an opera house. In Stage Fright the opera house becomes a Disco House, and then a general theatre. Both are terrorized.
The Phantom wants Christine to "win". In the original, it's the position of Prima Donna. In Stage Fright, it's Talent Star.
The Phantom sabotages Christine's main competition, a more experienced singer/diva named Carlotta, by switching her throat spray with an identical bottle filled with a throat irritant, causing Carlotta to lose her voice.
The Destruction of the Disco Ball is a reference to the Infamous Chandelier scene in the original.
Both the Phantom from the original version and the original Phantom live under the opera house, in the sewers, with a working organ, which they both play. They both have expert knowledge about the opera house, especially the secret passageways.
The scene where someone appears to be hanging, (until the lights are turned on and it is revealed only to be the Great Pauldini, stuck in one of his tricks and very much alive), is a reference to the original, where the Phantom murders a stagehand by strangulation, and then hangs his body from the rafters.
It premiered on Cartoon Network August 10, 2013 in Scooby-Doo! Back to School Marathon (August 10-11, 2013).
Dewey Ottoman's car and crazy driving may be a reference to the famous villain Cruella De Ville from the Disney movie 101 Dalmatians.
The internet search engine Velma uses is called, "Giggle", a play on "Google".
Fred is revealed to sleep with a net.
The first piece played by Emma Gale is Movement 1. "Allegro non molto" from Vivaldi's Concerto No. 4 in F minor, Op. 8, RV 297, "L'inverno", commonly known as "Winter", from his famous violin concerto set known as "The Four Seasons". Neither of Emma's pieces are listed in the credits.
The Soap Diamond and the Sponge of Turin are references to the famous Hope Diamond and the Shroud of Turin, respectively.