Doctor Who: The Brood of Erys continues our latest trilogy with the Sixth Doctor and Flip, and finds the pair separated by marauding aliens.

Space travellers are warned to keep away from the area of the planet Asphya and its unremarkable moon Erys. Not the best place to materialise the TARDIS, then – as the Doctor discovers when his ship is raided by the imp-like Drachee, and his companion Flip is carried away…

But the TARDIS isn’t the only stricken vessel in the region. Aboard a nearby space yacht, the Doctor encounters a woman who holds in her head the secret of Erys – a secret suppressed by amnesia, or worse.

Flip, too, is about to learn Erys’ secret. But once you know Erys’ secret, you can never escape.

Over in the Fourth Doctor Adventures, Doctor Who: White Ghosts finds the Fourth Doctor and Leela fighting the terrors that live in the night...

A close encounter with a stray missile leads the Doctor to materialise his TARDIS on a planet that hangs in the dark at the edge of the known universe. A planet so dark that it exists in near-permanent night. A planet that enjoys just a single day’s light once every thousand years…

Exactly what happens on the planet in its rare daylight hours – that’s what a geographical survey headed by Senior Tutor Bengel is stationed here to establish. They, the Doctor and Leela are about to discover that when daylight comes, the White Ghosts rise…

So don’t be afraid of the dark. The cover of night is a mercy.

Both stories are now available to download, and CD copies are being posted out today.