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 |
| Writing | Aaron Mendelsohn | Writer |
| Production | Malte Grunert | Producer |
| Production | Deborah Aquila | Casting |
| Writing | Philip LaZebnik | Writer |
| Production | Sytze van der Laan | Producer |
| Sound | Annette Focks | Music |
| Camera | Peter Krause | Director of Photography |
| Production | Tricia Wood | Casting |
| Production | Jennifer L. Smith | Casting |
| Production | Christa Schamberger | Casting |
| Production | Anna Feyder | Casting |
| Editing | Ueli Christen | Editor |
| Writing | Robert Arthur | Novel |
| Writing | Ronald Kruschak | Creative Producer |
| Production | Stuart Pollok | Executive Producer |
| Production | Bertha Spieker | Co-Producer |
| Production | Dieter Stempnierwsky | Line Producer |
| Art | Sylvain Gingras | Production Design |
| Production | Marco le Roux | Production Manager |
| Production | Boyd McMurtrie | Unit Manager |
| Crew | Gabriele Niemeyer | Post Production Supervisor |
| Directing | Lali Avis | Second Assistant Director |
| Directing | Jan Sebastian Ballhaus | First Assistant Director |
| Directing | Robert Benjamin | First Assistant Director |
| Directing | Ruben Engel | Third Assistant Director |
| Crew | Eva Franzen | Second Unit |
| Directing | Agne Januskyte | Second Assistant Director |
| Directing | Justin van der Merwe | First Assistant Director |
| Art | Steven Saunders | Sculptor |
| Sound | Ralph Thiekötter | Sound Re-Recording Mixer |
