Overview
The Sontaran Experiment is a two‑part serial of the British science‑fiction television programme Doctor Who. It aired as episodes 1 and 2 of the programme’s thirteenth season on 12 March and 19 March 1975. The serial was written by Robert Holmes, directed by Michael Ferguson, and produced by Philip Hinchcliffe. It features Tom Baker as the Fourth Doctor and John Levene as Sergeant Benton of the United Nations Intelligence Taskforce (UNIT). The antagonist is a lone Sontaran soldier, portrayed by Michael Wisher.
Plot summary
The Fourth Doctor and Sergeant Benton are dispatched by UNIT to investigate a distress signal from a remote research outpost on an unnamed planet in the far future. Upon arrival they discover that a Sontaran, conducting a weapons test, has released a lethal biological agent intended to exterminate the human inhabitants of the base. The Doctor works to neutralise the pathogen, rescue the surviving personnel, and prevent the Sontaran from completing the experiment. The story culminates with the Doctor destroying the Sontaran’s equipment and escaping the planet before it self‑destructs.
Production
- Serial code: 4G
- Writer: Robert Holmes
- Director: Michael Ferguson
- Producer: Philip Hinchcliffe
- Composer: Dudley Simpson (incidental music)
- Location filming: The entire serial was shot on location, primarily in the woods near Aldershot, Hampshire. This marked the first time a Doctor Who story was filmed entirely outside the BBC’s Television Centre studios.
- Budget constraints: The serial’s modest budget limited set construction, resulting in a heavy reliance on natural outdoor settings and a small cast.
Cast
| Actor | Role |
|---|---|
| Tom Baker | The Fourth Doctor |
| John Levene | Sergeant Benton |
| Michael Wisher | Sontaran |
| William Lucas | Professor Boland (guest) |
| Michael Craig | Journalist Eleanor (guest) |
| Peter Halliday | Technician (guest) |
| Others | Various human survivors |
Broadcast and reception
The Sontaran Experiment received mixed reviews upon its original transmission. Contemporary critics praised the atmospheric location work and the serial’s tension, while others noted the limited production values and the absence of a companion character. Retrospective assessments have similarly been divided; some commentators regard it as a noteworthy early example of location‑driven storytelling in the series, whereas others view it as a lower‑budget entry within the UNIT era.
Home media
The serial has been released on several formats:
- VHS – 1993 (BBC Video)
- DVD – 2008 (as part of “The Sontaran Experiment” standalone release)
- Blu‑ray – included in the “Doctor Who: The Fourth Doctor – The Collection” (2020)
- Audio – a soundtrack album featuring the original incidental music by Dudley Simpson was issued by BBC Records.
Cultural impact
The Sontaran species, introduced to the television series in 1973’s The Sontaran Stratagem, reappears in this serial, reinforcing their role as a militaristic, clone‑based alien race. The story’s emphasis on biological warfare predates later Doctor Who episodes that explore similar themes, contributing to the series’ broader exploration of ethical concerns surrounding scientific experimentation.
