And a nice anti-gun message at the core of the episode -- where the Doctor informs Ryan that guns never help -- yet off he goes to learn it the hard way. There's always someone in a Who series who tries this.

And yet, River Song always seemed to get away with it ...

Also, Graham was married to Ryan's grandmother, not his mother. And it really annoys me that he expects to be called "Grandad" when he isn't. I would never have called someone who married my mother or my grandmother "Dad" or "Grandad".