In the early 2000s, the gritty reboot trend was in full effect. 2005 saw Christopher Nolan pretty much invent the whole concept with "Batman Begins" and a year later, James Bond would get a similar treatment with the excellent "Casino Royale." But somewhere in there, a less likely hero returned to the screen. That return was suitably gritty, but it wasn't quite a reboot — more like a redo.

30 years after he first arrived on screens, Rocky Balboa was back with 2006's imaginatively-titled...

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