Series 4, Episode 4 | 2 parts | First broadcast: 26 April 2008 | Writer: Helen Raynor | Director: Douglas Mackinnon
Cast
- David Tennant as the Doctor
- Catherine Tate as Donna Noble
- Freema Agyeman as Martha Jones
- Christopher Ryan as General Staal
Summary
Reuniting with Martha Jones, now working for UNIT, the Doctor and Donna investigate a suspicious new eco-friendly car satnav system secretly being used by the warrior Sontarans to poison Earth’s atmosphere in preparation for a full invasion. As the Sontarans’ scheme accelerates and Martha is replaced by a clone duplicate, the Doctor races to stop the atmospheric conversion before it chokes out humanity entirely.
Interesting Facts
- This story marks Freema Agyeman’s return as Martha Jones, now working as a UNIT medical officer following her departure from full-time travel with the Doctor.
- It reintroduces the Sontarans to the revived series for the first time, following their long absence since the classic series.
- Donna’s granddad Wilfred Mott appears prominently, continuing his expanded role introduced in “Partners in Crime.”
- The cliffhanger ending, with the Doctor seemingly transformed into a Sontaran-aligned soldier via a fake regeneration ruse, was a notable misdirection resolved in the following episode.
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