The BBC have released the synopsis for episode 10 of the upcoming season, "The Girl Who Waited":
Amy is trapped in a quarantine facility for victims of an alien plague – a plague that will kill the Doctor in a day – as the time-travelling drama continues.
The Doctor can use the TARDIS to smash through time and break in, but then Rory is on his own. He must find Amy and bring her back to the TARDIS before the alien doctors can administer their medicine.
Rory is about to encounter a very different side to his wife. Can he rescue Amy before she is killed by kindness?
Amy is played by Karen Gillan, The Doctor by Matt Smith and Rory by Arthur Darvill.
Doctor Who Magazine have this to say about the episode:
The Doctor takes Amy and Rory for a relaxing break on Apalapucia, not realising that the planet is ravaged by a deadly disease – one that threatens even the life of the Doctor himself. But that’s not the biggest problem: Amy’s gone and got herself trapped in a very unusual hospital. How long will she have to wait before the Doctor comes back for her this time?
This episode will air on Saturday 10 September 2011.