What Do You Want With Me?

The 11th Doctor and Clara coming home from an adventure in 2941 Berlin and the TARDIS is stuck in a time vortex. What happens when an old foe returns? How will Clara cope being alone in the TARDIS without the Doctor? Will she be able to bring him back? Or, will the enemy seduce her first? [Whouffle (11 X Clara) and some Clara X Mr. Clever.]