The Doctor is summoned before the High Council of Time Lords to stand trial for the charges of harmful interference to the course of events during his travels which have threatened the sanctity of the universe. Indignant at these accusations, the Doctor pleads his case to the Inquisitor with the hope that she will see him as a source of hope and goodwill for existence. However, his prosecuting attorney, a sinister Time Lord known simply as the Valeyard, begins a crusade against the Doctor with the motive of framing him as a villainous renegade.
Unfortunately the movie Doctor Who: The Mysterious Planet is not yet available on HBO Max.
| Writing | Robert Holmes | Writer |
| Directing | Nicholas Mallett | Director |
| Production | John Nathan-Turner | Producer |
| Writing | Eric Saward | Script Editor |
| Sound | Dominic Glynn | Original Music Composer |
| Costume & Make-Up | Ken Trew | Costume Design |
| Art | John Anderson | Production Design |
| Costume & Make-Up | Denise Baron | Makeup Artist |
| Lighting | John Wiggins | Lighting Director |
| Sound | Bill Whiston | Sound |
| Production | Joy Sinclair | Production Assistant |
| Production | Clare Graham | Production Manager |
| Crew | Dick Mills | Special Sound Effects |
| Camera | Alec Wheal | Camera Supervisor |
| Lighting | Mike Jefferies | Lighting Director |
| Sound | Brian Clark | Sound |
| Visual Effects | Danny Popkin | Visual Effects |
| Editing | Stephen Newnham | Editor |
| Visual Effects | Mike Kelt | Visual Effects Designer |
