For a generation of Doctor Who fans, there's still a magic in remembering hearing that theme early on a 1970s Saturday teatime, with Tom Baker's face fading into the Time Vortex as his Fourth Doctor took us on another adventure...

With this month's Doctor Who - Philip Hinchcliffe Presents Volume 2: The Genesis Chamber (still being held at its exclusive pre-release price, while the third volume has today been named as The Helm of Awe) we're casting our minds back to those days. And to celebrate even further, this weekend we've put a large number of our Fourth Doctor titles at special offer prices.

All the stories from the first three series of Doctor Who - The Fourth Doctor Adventures, from Doctor Who - Destination Nerva to Doctor Who - Zygon Hunt, by way of Leela (Louise Jameson), Romana (Mary Tamm), Daleks, Jago & Litefoot (Christopher Benjamin and Trevor Baxter) and the Master (Geoffrey Beevers) - are available for £2.99 on Download, and £5 on CD (which unlocks a free download version).

In addition there are two discounted boxed sets - Doctor Who - The Lost Stories: The Fourth Doctor at £25 on CD and £22 on Download, and Doctor Who - Philip Hinchcliffe Presents Volume 1 at £45 on CD and £40 on Download. And our gorgeous book-packaging release of Doctor Who - The Novel Adaptations Volume 1 (containing The Romance of Crime and The English Way of Death) can be bought for £30 on CD or £20 on Download.

Check out all of our Fourth Doctor stories here, and our special value bundles here. And don't forget that any of these purchases - CD or Download - will be instantly available to listen to via our free Big Finish apps!

This weekend's offers all end at mid-day (UK time) on Monday.