The Unzal Incursion was the first story in The Third Doctor Adventures: Volume Seven. It was written by Mark Wright and featured Tim Treloar as the Third Doctor, Daisy Ashford as Liz Shaw and Jon Culshaw as Brigadier Lethbridge-Stewart.
But something goes wrong. Can it be that UNIT has been betrayed from within? Suddenly bases are falling across the globe, and only the Doctor and his friends are able to escape.
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- The Doctor - Tim Treloar
- Liz Shaw - Daisy Ashford
- Brigadier Lethbridge-Stewart - Jon Culshaw
- Sergeant Nicola 'Nicki' Attah - Misha Malcolm
- Private Robbins - Sam Benjamin
- Cherilyn Dankworth - Clare Corbett
- Harper - Avita Jay
- Unzal / Unzal 2 - Gary Martin
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- The same technique for repeating the last episode's cliffhanger as used in The Ambassadors of Death is used in this story, where the sting is heard after the repeat.
- The story contains a post-credits scene after the theme tune finishes at the end of Part Four. The same technique was previously used in Across the Darkened City. In both cases, the scenes highlight how the stories relate to plot developments in the TV series.
- Daisy Ashford returns to the role of Liz Shaw, originally played by her mother, Caroline John. Ashford first voiced Liz in Primord in The Third Doctor Adventures: Volume Five.
- Liz mentions how she was skeptical about the existence of aliens when she first joined UNIT. (TV: Spearhead from Space)
- The Brigadier pilots the C-130 Hercules which the Doctor remembers from the Cyberman invasion. (TV: The Invasion)
- John Benton is mentioned as having been recently promoted to sergeant. (TV: The Ambassadors of Death)
- The guests at reception for the opening of Hotspur include Sir John Sudbury and Lord Rowlands. (TV: Time-Flight et al, Terror of the Autons)
- The security doors at UNIT HQ are reinforced using Dynastreem. (TV: Robot)
- The Doctor believes that the Unzal Incursion required outside assistance from someone capable of hypnosis and interstellar travel. He calls the incident a "stress test" designed to gauge the effectiveness of UNIT and Earth's defenses against extraterrestrial invasion, with further waves to come. While he remains unsure of the identity of the party involved, elsewhere Dankworth is drawn into a trance, repeatedly writing "You will obey me" in her journal. (TV: Terror of the Autons, The Mind of Evil, The Claws of Axos, et al.)
- The Brigadier asks for Corporal Bell. (TV: The Mind of Evil, The Claws of Axos)