Mega spoilers under the cut...
- We see River Song.
- Somebody dies.
- Martha, Rose and Donna make an appearance as a hologram / picture or some sort.
- Fishfinger Custard makes a return.
- Rory punches Hitler (and there is another punch too)
- Watch out for the 'Order of the Silence', 'Numbskulls' and 'Corn Circles'.