It's sad to think that Empress of Mars could be Mark Gatiss's last episode for Doctor Who. The writer has stated he is unsure if he will return, and as someone who has enjoyed the majority of his episodes for the show I will be disappointed if he doesn't return under Chris Chibnall (NB: Mark Gatiss did not return under Chris Chibnall). Mark Gatiss gets a lot of unfair criticism from certain sections of the fanbase; he is essentially the Helen Raynor of the Moffat era, who also received a lot of harsh comments (and in my cases, personal abuse) from Whovians. Empress of Mars is Mark Gatiss's ninth episode for the show, and is probably my least favourite out of his televised stories.

There are some nicely bizarre visual images in this story, and to begin with it has a wonderfully surreal feel. I never thought I'd see a bunch of victorians having a tea party on Mars, or the Ice Warriors waging war on an army of victorian soldiers. It's also nice to finally see an Ice Warrior story set on Mars and exploring more of the race's mythology; the introduction of the Ice Queen is cool and makes a lot of sense given how the Ice Warriors live in hives. She is essentially the queen bee who doesn't want to be disturbed...but of course, this is Doctor Who. If she were to never wake up from her tomb, there would be no story.

Unfortunately the episode quickly runs out of steam. The tea party goes on for way too long, and it takes too much time for the Ice Warriors and their Ice Queen to wake up. The episode adopts more of a classic series style of pacing, and whilst it works with episodes such as Smile that use it to create a sense of mystery here it feels more detrimental to the story. This should be an episode with lots of action; a Doctor Who blockbuster, like Asylum of the Daleks. Instead it's more like The Hungry Earth/Cold Blood, and its central idea of human beings as the invaders is interesting but not explored enough for it to be as thought-provoking as its potential would allow it to be.

Then there's the TARDIS misbehaving sub plot, which feels incredibly shoe-horned in and doesn't fit the episode at all. It just comes out of nowhere; Nardole returns to the TARDIS and the ship takes off, returning him to the vault he has been guarding with the Doctor on Earth. The entire sub plot seems to only exist partly so the story arc is featured in the episode and partly because Mark Gatiss didn't know Matt Lucas would be a companion at the time of writing. It's a very strange way to write Matt Lucas out of the main plot when the Doctor could have explained to Bill in one line that he's currently guarding the vault.

Mark Gatiss deserves credit for introducing the amazing Ice Queen however. The Ice Queen is an amazing addition to the Doctor Who universe and a monster who I definitely hope we get to see return sooner rather than later. She gives the Ice Warriors a nice sense of regality which directly mirrors the victorians and their beloved Queen Victoria (a portrait of whom appears in the episode - based on Pauline Collins' take on the monarch); the Ice Queen's presence is so intimidating and the design so memorable that I have a feeling she will become one of the Moffat era's most beloved creations. Here's to many more Ice Warrior stories featuring the excellent Ice Queen, and a load of Big Finish audio dramas chronicling her rise to power. Maybe we might even see standard female Ice Warriors in future?

Of course, one thing you've got to mention in a review of Empress of Mars is the return of Alpha Centauri (and the original voice actor, Ysanne Churchman) - and what a triumphant return it is for everybody's favourite hexapod. Alpha Centauri returns in style, answering a distress call from Mars and welcoming the Ice Warriors to the universe - and subsequently, the Galactic Federation. You see, Empress of Mars is secretly a prequel to The Curse of Peladon and it feels completely natural for the story.

The story leads up to this moment with the introduction of friendly Ice Warrior Friday (Richard Ashton), and it's both Friday and the actions of cowardly Colonel Godsacre (Anthony Calf), who shoots Captain Catchlove (Ferdinand Kingsley) (Who wants to claim Mars in Queen Victoria's name), that brings the end of the Ice Warrior-Victorians war, and sees the Ice Queen forming a peaceful alliance with Godsacre. The Ice Queen is impressed with how Godsacre is prepared to sacrifice a member of his own kind for peace with the Ice Warriors , and this falls nicely in line with the Ice Warriors' code of honour.

Overall, Empress of Mars is possibly Mark Gatiss's weakest story. The episode starts off fine with surreal scenes such as a victorian tea party on Mars but quickly loses steam, and it takes too long for the Ice Warriors and the Ice Queen to wake up. There's a neat return for a classic series character though, and the Ice Queen is awesome.