Haven't seen it, will look for it in iplayer. While I understand that Marathon is a pivotal moment. It seems a bit like starting well into the story. I would presume that they do some reverse context setting for it to explain the set up of the city states at the time and why they ended up in conflict with the Persians. The great flowering of Greek, particularly Athenian, culture that follows does not spring unheralded like Athena from Zeus' head
