The TARDIS arrives on the unnamed planet of the Gonds, who are ruled and taught in a form of self-perpetuating slavery by the alien Krotons — crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years earlier after being damaged in a space battle. The Krotons are in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, nominally to become "companions of the Krotons", but in truth to have their mental energy drained, after which they are killed.
Unfortunately the movie Doctor Who: The Krotons is not yet available on HBO Max.
| Directing | David Maloney | Director |
| Writing | Robert Holmes | Writer |
| Writing | Terrance Dicks | Script Editor |
| Production | Peter Bryant | Producer |
| Visual Effects | Bill King | Visual Effects |
| Sound | Brian Hodgson | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
| Art | Raymond London | Production Design |
| Crew | Brian Hodgson | Special Sound Effects |
| Lighting | Howard King | Lighting Director |
| Costume & Make-Up | Sylvia James | Makeup Artist |
| Sound | John Holmes | Sound |
| Editing | Martyn Day | Editor |
| Camera | Alan Jonas | Camera Operator |
| Crew | Fred Wright | Technical Supervisor |
| Sound | Ron Blight | Sound |
