MI-5 a/k/a Spooks

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4. Well that's what's refreshing about it

Most shows you can tell who is expendable and who is key to the franchise. The classic is the Star Trek away party when you know the red shirt guy is in trouble! And then you have some superhero movie like Batman, where no matter how dire the situation is, you already know the hero escapes somehow.

But this makes it much more exciting because now *every* time one of a star character get in a jam, you have to worry that maybe they actually won't survive this. So it gets you more involved in everything.