Madame Vastra arranges a conference call.
Clara is still trying to perfect her mum's souffle.
Clara and River Song meet for the first time at the conference call.
Trenzalore is where The Doctor is buried. He needs to visit his own grave in order to save Vastra, Jenny and Strax.
River Song is dead. She kept the link open between she and Clara after the conference call.
Once inside The Doctor's tomb, a giant overgrown TARDIS, Clara begins to remember their revealing conversation from the past.
The Great Intelligence demands The Doctor's name in return for allowing his friends to live.
Did the Doctor say (through River) that his name was Hayes?
The Great Intelligence plans on entering The Doctor's life by entering it and rewriting it to thwart everything he ever did.
Clara realizes the only way to save The Doctor is to sacrifice herself and start fresh again.
The Doctor has a satisfying, lovely goodbye scene with River before jumping into his own timeline to save Clara.
John Hurt is revealed as the future Doctor.