Science Fiction. The twelfth Doctor (Peter Capaldi) and the first doctor (David Bradley) must close a time loop by returning a World War I soldier (Mark Gatiss) to the battlefield.
- Infrequent use of cursing
- Infrequent portrayals of gun, weapons, and hand-to-hand violence, most a science fiction context – no blood, little detail
- Infrequent portrayals of alcohol us in a recreational context
- The importance of memory
- Letting go
- Confronting the past
Rated PG for genre violence