Don't know whether anyone knows anyhing about this episode or whether anything leaked but here is my wild idea of how it could be...
I don't think we'll see any Nazi's as that would be too much even for Dr Who.
Someone in our time discovers time travel or finds an abadonned vortex manipulator etc. They go into the past and change something minor (history can be made and remade...) which alerts the doctor...
This person then decides to go and kill Hitler before he's the Fuhrer, and totally change the course of history. To avoid a fathers day type scenario Dr Who must stop him...
I've often wondered that if I could time-travel that's something I'd do, believing it would save millions of lives. However, supposing someone else even worse came to power and started WW2 five years later, after inventing nuclear weaopons....
I don't think we'll see any Nazi's as that would be too much even for Dr Who.
Someone in our time discovers time travel or finds an abadonned vortex manipulator etc. They go into the past and change something minor (history can be made and remade...) which alerts the doctor...
This person then decides to go and kill Hitler before he's the Fuhrer, and totally change the course of history. To avoid a fathers day type scenario Dr Who must stop him...
I've often wondered that if I could time-travel that's something I'd do, believing it would save millions of lives. However, supposing someone else even worse came to power and started WW2 five years later, after inventing nuclear weaopons....