A new case for the cult detectives! Not by coincidence, a mysterious videotape falls into the hands of Jupiter Jones, Pete Crenshaw and Bob Andrews during Jupiter's birthday party in Rocky Beach. On it is a recording of Jupiter's long dead parents. In their message they want to communicate to their son the key to an especially tricky riddle.
Unfortunately the movie The Three Investigators and the Secret of Terror Castle is not yet available on HBO Max.
| Directing | Florian Baxmeyer | Director |
| Production | Malte Grunert | Producer |
| Production | Anna Feyder | Casting |
| Sound | Annette Focks | Music |
| Production | Tricia Wood | Casting |
| Writing | Aaron Mendelsohn | Writer |
| Production | Sytze van der Laan | Producer |
| Camera | Peter Krause | Director of Photography |
| Production | Christa Schamberger | Casting |
| Writing | Philip LaZebnik | Writer |
| Production | Deborah Aquila | Casting |
| Production | Jennifer L. Smith | Casting |
| Directing | Agne Januskyte | Second Assistant Director |
| Writing | Ronald Kruschak | Creative Producer |
| Production | Stuart Pollok | Executive Producer |
| Directing | Lali Avis | Second Assistant Director |
| Crew | Eva Franzen | Second Unit |
| Production | Marco le Roux | Production Manager |
| Art | Sylvain Gingras | Production Design |
| Writing | Robert Arthur | Novel |
| Production | Boyd McMurtrie | Unit Manager |
| Directing | Robert Benjamin | First Assistant Director |
| Directing | Ruben Engel | Third Assistant Director |
| Directing | Jan Sebastian Ballhaus | First Assistant Director |
| Production | Dieter Stempnierwsky | Line Producer |
| Directing | Justin van der Merwe | First Assistant Director |
| Production | Bertha Spieker | Co-Producer |
| Crew | Gabriele Niemeyer | Post Production Supervisor |
| Editing | Ueli Christen | Editor |
| Art | Steven Saunders | Sculptor |
| Sound | Ralph Thiekötter | Sound Re-Recording Mixer |
