The Beatles or The Beach Boys?
Captain Kirk or Captain Picard?
Windows or Macintosh?
J. R. R. Tolkien or C. S. Lewis?
Edward or Jacob?
The Hardy Boys or The Three Investigators?
Their first case is to find an authentic haunted house, and this is how they become connected with the famous movie director, Alfred Hitchcock. Although he doesn't solicit their help, he grudgingly agrees to let them try as he wants a real haunted house for his next movie. An old forgotten castle deep in the Hollywood hills built by a silent film star, Stephen Terrell, is reputed to be haunted and no one has been able to spend a night there since his untimely death many years earlier. "Terrell Castle" became known as "Terror Castle" and Jupiter thinks it is a good possibility.
(And for the record, the correct answers above are: the Beach Boys, Picard, Windows, Tolkien, and Jacob.)