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.
Written By: Andrew Smith
Directed By: Nicholas Briggs
Colin Baker (The Doctor), Lisa Greenwood (Flip Jackson), Nicola Sian (Sarra Vanser/Female Drachee), Tori Hart (Lona), Chris Overton (Terrill/Levek), Brian Shelley (Renval/Erys), Glynn Sweet (Elgin Vanser)