The Marian Conspiracy marks a major turning point for Big Finish’s Monthly Adventures—and for Colin Baker’s Sixth Doctor. Jacqueline Rayner’s confident, tightly structured script gives Baker the material he never quite got on television, allowing his Doctor to be witty, warm, and wonderfully sharp without the abrasive edge that once made him a harder sell. The story balances historical detail with compelling character work, and never overstays its welcome. It’s the first time the range really feels like it knows what it’s doing, and the result is a polished, engaging audio drama that still holds up brilliantly.

At the heart of its success is the introduction of Evelyn Smythe, a sharp, no-nonsense history professor brought to life with irresistible charm by the late Maggie Stables. Unlike many companions before her, Evelyn doesn’t scream, swoon, or ask too many questions—she challenges the Doctor intellectually and morally, and their chemistry is immediate. Their opening conversation alone is a joy to listen to, setting the tone for a partnership built on mutual respect and gentle bickering. It’s refreshing to hear a story where so much of the drama comes from the characters themselves, rather than technobabble or alien threats.

Though it plays with a sci-fi conceit—Evelyn’s existence being threatened by a time anomaly—this is essentially a pure historical, and one that uses its setting with real intelligence. Tudor England is rendered vividly, and Queen Mary is written as a complex, sincere figure rather than a stock villain. A standout moment sees the Doctor challenge her beliefs without resorting to moral grandstanding, a testament to the script’s subtlety. By the time the story finishes, it’s clear that Big Finish has found its voice—and that the Sixth Doctor has, at long last, found the companion who brings out the best in him.

The Marian Conspiracy is easily the highlight of the small number of Big Finish's output I have listened to so far (the others being Helicon Prime, Storm Warning, Sword of Orion and The Spectre of Lanyoon Moor). It's status as a pure historical works to its advantage, managing to craft a brilliant story. Evelyn also makes a superb first impression, and immediatly works wonderfully alongside Colin Baker's 6th Doctor. It's such a shame that these 2 weren't on TV together, as I believe they have the potential to rival pairings such as 2 and Jamie or 3 and Jo. Overall, a solid 9/10 = 4.5/5 story.

Fantastic story, blending its historical elements, and setting fantastically with humour, stand-out voice performances, and real tension and threats which carry the story wonderfully. The characters are brilliant, particularly Evelyn Smythe in her introduction story, who from the off, cements herself as a wonderful companion, who works fantastically to counteract the Sixth Doctor's harsher side.

Truly remarkable!

This was really lovely. I am always huge when Who does a pure Historical, especially with a Doctor that doesn’t have a televised one (then again only 1, 2 and 5 have that, so…).
Anyway I really adore this Story, my Expectations were quite low and this is by no means my first exposure to Evelyn, who is excellent. And yet… I really did love this Story.
Colin and Maggie have such an energetic chemistry already in their first outing.
The whole Conflict about this Story is just superb!
Honestly this one has so many great Moments, for example when the Doctor and Evelyn are accused of trying to poison the Queen, this whole Discourse is just exceptional! And really shows how well the Story balances humor, as well as the subject, which is rather serious.

Thworping through time and space, one adventure at a time!

"The Marian Conspiracy: A Tudor Tale with Wit and Intrigue"

Jacqueline Rayner delivers a standout entry in Big Finish's early catalogue with The Marian Conspiracy. This story blends sharp humour, Tudor politics, and the debut of Evelyn Smythe, a companion who quickly became a fan favourite.

The narrative begins with an engaging lecture by Evelyn Smythe, interrupted by the Sixth Doctor as he investigates a nexus point tied to her. This opening not only introduces Evelyn’s no-nonsense, clever persona but also establishes the mystery of her vanishing family history.

Evelyn's pragmatic reaction to the Doctor, time travel, and the TARDIS is a breath of fresh air. She refuses to let the Doctor dominate the narrative, standing as his intellectual equal. The interplay between the two, particularly during their encounter with Queen Elizabeth I, is a highlight. Their witty exchanges establish Evelyn as a perfect foil to Colin Baker's Doctor, offering a dynamic that feels both natural and refreshing.

The story transitions into a delightful pure historical setting, focusing on Tudor court politics and intrigue. Evelyn, with her bold attitude and historical expertise, ventures into trouble on her own, while the Doctor finds himself ensnared in royal schemes as the Queen’s physician. The historical backdrop is richly detailed, enhanced by an excellent soundtrack and period-appropriate dialogue that immerse listeners in the era.

Maggie Stables shines as Evelyn, embodying her intelligence and assertiveness. Her character’s modern sensibilities add a layer of humour, particularly when introducing concepts like cocoa and painkillers to astonished Tudor courtiers. Colin Baker is in peak form, and Anah Ruddin’s portrayal of Queen Elizabeth I brings both gravitas and warmth. The supporting cast, especially Barnaby Edwards as Francois De Noailles, clearly enjoy their roles, adding to the lively atmosphere.

While the middle parts of the story focus more on character interactions and scheming than plot progression, these moments are far from dull. They add depth to the narrative, showcasing how individual actions shape history. The final episode brings a series of clever twists and laugh-out-loud moments, revealing how the Doctor and Evelyn inadvertently influenced historical events.

📝Verdict: 9/10

Overall, The Marian Conspiracy is a charming, character-driven tale with sharp writing and a light-hearted tone. It successfully captures the essence of a 1960s-style historical while establishing Evelyn Smythe as one of Big Finish's finest original companions. A must-listen for fans of the Sixth Doctor and those who enjoy a historical adventure with wit and heart.