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.
| Directing | Nicholas Mallett | Director |
| Writing | Robert Holmes | Writer |
| Production | John Nathan-Turner | Producer |
| Writing | Eric Saward | Script Editor |
| Costume & Make-Up | Denise Baron | Makeup Artist |
| Art | John Anderson | Production Design |
| Sound | Brian Clark | Sound |
| Visual Effects | Mike Kelt | Visual Effects Designer |
| Production | Joy Sinclair | Production Assistant |
| Lighting | John Wiggins | Lighting Director |
| Sound | Bill Whiston | Sound |
| Editing | Stephen Newnham | Editor |
| Costume & Make-Up | Ken Trew | Costume Design |
| Sound | Dominic Glynn | Original Music Composer |
| Crew | Dick Mills | Special Sound Effects |
| Production | Clare Graham | Production Manager |
| Camera | Alec Wheal | Camera Supervisor |
| Visual Effects | Danny Popkin | Visual Effects |
| Lighting | Mike Jefferies | Lighting Director |
