Amy's Choice

The Doctor visits Rory and a very pregnant Amy in the quiet village where they've taken up residence after their marriage. However, they soon discover that they're living a dream and are actually in the TARDIS, plummeting toward a cold star. Or... they're in a village and having a dream of the TARDIS plummeting toward a cold star. A mysterious enemy of the Doctor appears and warns them that they must determine which is reality, or they will die.