Perhaps a reference to the Mossad assassins after the Munich bombing? Or since the robot was after war criminals, Adolf Eichmann.
That's indeed what I meant. If there's somebody cool enough to employ time-travelling shapeshifting robots in a war-criminal-hunting business, it must be Mossad. And I must say I liked the whole idea a lot, it's strong enough to carry its own series. The idea itself is awesome; it's just execution that sucked a bit.
You know, I really don't know what a show that's primarily aimed at children can really do with Adolf Hitler. That's such a huge, such a monumentally dark and weighty and horrible thing, I really don't know if it would even be appropriate for Doctor Who to make an earnest effort to tackle the Third Reich. You can't really do Downfall on a kid's show. That's the sort of thing that's more appropriate for programs aimed at adults.
Then possibly they shouldn't bring Hitler into play at all. Although I honestly believe there are ways to tackle it. The whole Nazi era is just delightfully creepy, scary and hopeless - and they end up using it as a backdrop for River Song running around in a SS jacket.
They could, for instance, continue with the whole idea of Doctor being forced to cooperate in the assassination of Hitler (and having to save Hitler in order to prevent the temporal paradox or something). Not exactly original, but it could be done.
Or they might take the whole thing a parody. Although that was actually already made - as you can see in
this European time-travel flick from 70s (basically a bunch of Nazis come back from retirement and attempt to use the time machine to supply Hitler with a hydrogen bomb).
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I also apologize to anybody offended with the "token black" thing. I only meant to imply that the choice of actress (and, in extension, the whole idea of timelords being able to regenerate into different ethnicity) feels like a political decision, not a creative one - because they promptly killed Mels only minutes after arriving into the Nazi Germany, thus effectively wasting the immense coolness factor of
a swashbuckling black woman in a SS jacket running around Nazi Berlin with a machine gun. Which is something I'd gladly pay to see.