Something I’m appreciating as I watch The Celestial Toymaker episode by episode are the performances of Carmen Silvera and Campbell Singer as the Toymaker’s various animated dolls, cards and fairy tale characters. While Michael Gough tends to get the attention, Silvera and Singer are the heart of the story – The Hall of Dolls‘ haughty queen and absent-minded king are now a homely cook and a blustering soldier. Through them, we understand, as Dodo comes to see, that the Toymaker’s servants are his victims, and their humanity makes them perhaps too kind to make Steven and Dodo’s tasks impossible. Without Silvera and Singer, this would be a much flatter episode.

In a strange way, the Monoids are a more compelling bunch of characters than the humans on the Ark. As they gossip between themselves, they share their worries and hopes for the future. One covets Refusis as ‘a new planet of our own where we can establish our own way of life’. He’s becoming a proper tin-pot dictator, gesticulating wildly and giving every impression he enjoys his position. His chief rival, Four, sees through his increasingly grandiose plans though – ‘Your orders? You have given too many and delivered them unwisely.’

There is a good effort to mark the passage of time since The Plague: the statue, just a giant plinth and feet last time, is now complete, and the floor of the jungle is covered in autumn leaves. The Ark is nearly at Refusis Two.

The episode begins with a fairly weighty discussion on the morality of time travel, and the possibility that the TARDIS has been spreading deadly germs throughout time and space. ‘I don’t want to think about it, it’s too horrifying,’ says the Doctor, closing down any further discussion. So the question is never resolved. To an extent, it’s slightly pointless to raise such a significant idea only to leave it hanging, and I wonder if it’s part of an effort by Wiles and Tosh to question the ethics of the Doctor’s travels. As with The Family of Blood 40 years later, the audience is asked to consider if the Doctor didn’t land here, on a whim, would anybody have died? Neither Wiles nor RTD has an easy answer, but it’s clearly an idea that’s unsettled both.

After the doom and gloom of the last six weeks, this is a fantastic breath of fresh air. The opening is excellent: toucans and lizards hopping about a jungle, disturbed by the approach of an alien creature – the camera pans across and the TARDIS arrives. Out comes Dodo, full of beans, followed by a very grumpy Steven – both unaware of the alien creature stalking the forest.

As the episode opens, Steven has returned to Anne believing that he has seen the Doctor’s dead body, and begins a desperate search for the TARDIS key in Preslin’s shop. Then, without a word of explanation, the Doctor turns up, and it quickly becomes clear that he wasn’t impersonating the Abbot.

‘Let us finish with this tedious business.’ There’s a lot of talk about French finances, foreign policy and family conflict in this episode, which is all very worthy, and might even be gripping if the series were Game of Thrones and we were invested in any of these people – but many of them, including the feckless King, his scheming Queen Mother and the stolid Toligny – haven’t appeared before.