A movie based on this book aired on Disney XD on March 19, 2010 and then aired another one on April 2010.
castle | Windsor Castle | Castle | Secret Intelligence Service | Victoria's Secret | War on Terror | The Secret Garden | Edinburgh Castle | United States Secret Service | On Her Majesty's Secret Service (film) | On Her Majesty's Secret Service | Balmoral Castle | Reign of Terror | Castle (TV series) | Prague Castle | Castle Donington | secret society | Corfe Castle | Castle Hill | Secret Service | Castle Hill, New South Wales | Powis Castle | Roy Castle | Colditz Castle | Castle Combe | New Castle | Nagoya Castle | Dublin Castle | war on terror | New Castle, Delaware |
Although the German version of The Three Investigators starts with The Secret of Terror Castle, it continues through The Mystery of the Cranky Collector, then picks up with the "Crimebusters" series and continues on with German-language originals from there (starting at number '57').