Being Human writer Jamie Mathieson will return to Doctor Who next season for an episode co-written with Steven Moffat.

Mathieson joined the Doctor Who writing team last year with ‘Flatline’ and ‘Mummy on the Orient Express’.

He told CultBox last year: “If my computer ever gets hacked, there’s massive folders full of Doctor Who ideas! I’m a massive nerd, so I’ve been thinking about aliens and robots and ghosts since I was about 5 – there’s a whole life of me thinking about this kind of stuff.”

His new story is titled ‘The Girl Who Died’ and is believed to be Season 9’s fifth episode.

As previously rumoured, Catherine Tregenna will make her Doctor Who debut with ‘The Woman Who Lived’, thought to be Season 9’s sixth episode. She is the show’s first female writer since 2008.

Tregenna has previously written four episodes of Torchwood, as well as DCI Banks, The Fixer, Lewis and Law & Order: UK.

‘The Girl Who Died’ and ‘The Woman Who Lived’ will be directed by Ed Bazalgette (Poldark).

It was announced this morning that Game of Thrones actress Maisie Williams will guest star in Season 9, although it has not been confirmed which of the two episodes she will appear in.

> Take a look at our list of Game of Thrones actors who’ve appeared in Doctor Who.

Season 9 began filming in Cardiff in January and will air on BBC One this autumn.

> Here’s everything we know about Season 9 so far.

What do you think the new episode titles mean? Let us know below…