We've just met a new Doctor Who companion on TV - join us for some moments when that happened at Big Finish!

To celebrate the arrival of Bill Potts in the TARDIS this evening, as Doctor Who - Series 10 debuts on BBC1, we've got four appropriate Big Finish Doctor Who titles at special offer prices for you until mid-day (UK time) Tuesday 18th April:

Doctor Who - Storm Warning introduced Charlotte "Charley" Pollard (India Fisher) to both the Eighth Doctor and Big Finish fans, and until Tuesday this first adventure - on Download only - is available for just 99p.

Doctor Who - The Crimes of Thomas Brewster introduced us to Lisa Greenwood's fiesty, independent Philippa 'Flip' Jackson, who's since travelled the universe with the Sixth Doctor in a number of adventures. Over the weekend, this story is currently available for £5 on Download and £6 on CD.

Doctor Who - Persuasion brought probationary UNIT operative Will Arrowsmith into the TARDIS, played by Christian Edwards. His first adventure is also priced at £5/£6.

And in Doctor Who - Criss-Cross, the Sixth Doctor met Mrs Constance Clarke (Miranda Raison) in war-time Bletchley Park, before being joined by her on adventures which so far have included encounters with the Rani and the Daleks. Their first meeting is also £5/£6:

Two Doctor Who - Series 10 Week 1 bundles are available: a CD option containing the latter three adventures for £18, and a Download option which includes all four stories for just £15 - to make ordering these as easy as possible.

As ever, a CD purchase unlocks free access to a digital version as a Big Finish exclusive - if you're an Apple or Android device user, get our free Big Finish App which makes download/listening as easy as possible.

All offers end at mid-day (UK time) on Tuesday 18th April. Have a happy Easter!