- Title: The Catalyst
- Series: Doctor Who Companion Chronicles
- Discs: 1 CD
- Author: Nigel Fairs
- Director: Nigel Fairs
- Characters: Leela, Fourth Doctor
- Cast: Louise Jameson, Timothy Watson
- Date Reviewed on GoodReads: 02/06/2020
**Spoiler Alert** The Catalyst is a story in Big Finish’s Companion Chronicles series, and it is an early one. The story features Leela of the Sevateam as she tells the story of one of her journeys with the Doctor. The wrap-around story has Leela, captured, held prisoner, and being tortured by a member of the Z’Nai, a fierce, prejudicial, and evil warrior race. The main story has the Fourth Doctor and Leela encountering the Z’Nai in Edwardian England. It works much better than the framing story.
The Doctor brings Leela to a country manor house in Edwardian England to “teach her some table manners”. After an awkward dinner, Leela and the spoiled young daughter, Jessica, explore the servants’ hall and the cellars. They discover a hidden “trophy room” belonging to Jessica’s father and the Doctor. It turns out that her father had traveled with the First Doctor for a time. But it isn’t just “certificates and cups” as Leela refers to a trophy room that the two women find. An alien is imprisoned in the room, held in a stasis and decontamination field.
Jessica finds and presses a button that wakes up the soldier, though he is still trapped and unable to move. The soldier claims he is the last of his people, that they were destroyed by the Doctor. Leela doesn’t trust the soldier and leaves to find him to find out more about the situation. Jessica refuses to leave the room with Leela, telling her she wants to learn from the soldier. It will be a fatal decision.
When Leela and the Doctor return – the soldier has been released, and Jessica is dead. Tracking the soldier – they find both of the Douglas family’s servant girls are dead, as well as the butler and Mrs. Douglas. Leela and the Doctor find the warrior, who goes on and on about the Doctor “causing” the disease that wiped out his people. But the Z’Nai that the warrior leads (he is the Emperor, not a simple soldier) are Xenophobic, prejudicial, and arrogant – they had been wiping out everyone who was not Z’Nai when the Doctor and Mr. Douglas encountered them. And even on their own planet, the Z’Nai had opened purification camps, where those who did not agree with the Emperor’s hatred of everything and everyone different from himself were killed or converted into soldiers – clones of the emperor. Clones that looked, sounded, and thought exactly like the Emperor. Almost immediately after finding the Z’nai emperor Humbrackle, he collapses, a victim of the disease that killed the clone Z’Nai. The Doctor and Leela take him into the TARDIS for medical treatment then return him to his stasis field in the house.
When the Doctor and Leela return to the Edwardian House, a Z’Nai warship arrives. It’s arrival causes the windows and door frame of the house to blow out. The Doctor is knocked unconscious by a flying piece of wood. The warriors attack and kill Mr. Douglas, the only one left alive by Humbrackle. One of the soldiers attacks Leela after she tells him she doesn’t know the date because she is a time traveler. Leela fights back and the soldier immediately becomes very sick from her touch. The other soldiers shoot down the infected warrior. There’s a massive fight between Leela and the soldiers – but when she touches them, they die. The Doctor wakes up and trying to mitigate the fight, but he is attacked as well. Leela spits at the soldier attacking the Doctor – and the soldier dies. At the end of the fight, all the soldiers are dead from the now airborne virus. The Doctor tells Leela she’s become a carrier, a catalyst. The Doctor burns down the house and all the evidence of the invasion and the Doctor and Leela leave in the TARDIS.
In the wrap-around story, an ancient Leela is still held prisoner by a Z’Nai warrior. It speaks as if generations of Z’Nai have existed, as clones, destroying everyone that is not Z’nai in their path, all the so-called “lesser” species. Leela remarks that the Z’Nai used to leave a panel open in their armor, exposing their skin. The warrior remarks they no longer follow such absurd customs, but he likes to remove his helmet and look someone in the eye before killing them.
Overall, The Catalyst is a good story, but it’s about average for the Companion Chronicles. Basically, it’s War of the Worlds fierce, genocidal, alien race is knocked out by the common cold (or some sort of virus). I also found it strange the Doctor would use “carrier” and “catalyst” as synonyms. A carrier is someone who carries a disease or genetic defect but isn’t affected by it, such as a carrier for color blindness or hemophilia or typhoid. A catalyst is a chemical substance that causes a chemical reaction – but isn’t affected by the reaction. Not really the same. And for the Doctor to explain what a carrier is to Leela by saying it’s like a catalyst probably made the idea as clear as mud to her. And yet again – Leela dies at the end of the story, but of extreme old age after being imprisoned. The central story worked, but I felt the wrap-around story did not and wasn’t even necessary. The listener gets all the information they need from the dialogue in the central story, so the wrap-around wasn’t needed. But this is an early story in the range. I still recommend it, especially if Leela is one of your favorite companions because Louise Jameson is terrific performing this.