Still trapped in E-Space, the Doctor, Romana, Adric and K9 encounter a medieval civilisation dominated by the Three Who Rule, vampires who govern from their mighty castle.
Unfortunately the movie Doctor Who: State of Decay is not yet available on HBO Max.
| Writing | Terrance Dicks | Writer |
| Directing | Peter Moffatt | Director |
| Production | Barry Letts | Executive Producer |
| Production | John Nathan-Turner | Producer |
| Sound | Paddy Kingsland | Original Music Composer |
| Writing | Christopher H. Bidmead | Script Editor |
| Camera | Fintan Sheehan | Camera Operator |
| Sound | Bryan Showell | Sound |
| Lighting | Bert Postlethwaite | Lighting Director |
| Production | Rosalind Wolfes | Production Assistant |
| Visual Effects | Dave Chapman | Visual Effects |
| Visual Effects | Tony Harding | Visual Effects |
| Costume & Make-Up | Amy Roberts | Costume Design |
| Sound | John Howell | Sound |
| Crew | Stuart Fell | Fight Choreographer |
| Editing | John Lee | Editor |
| Crew | Dick Mills | Special Sound Effects |
| Editing | Rod Waldron | Editor |
| Costume & Make-Up | Norma Hill | Makeup Artist |
| Art | Christine Ruscoe | Production Design |
| Camera | Alec Wheal | Camera Operator |
