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Currently you are able to watch "Castle - Season 2" streaming on Disney Plus or buy it as download on Apple TV, Microsoft Store.
There are no options to watch Castle for free online today in Australia. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
If you’re interested in streaming other free movies and TV shows online today, you can:
Best-selling mystery novelist Rick Castle’s unique approach to crime solving may have won over Detective Kate Beckett, but after crossing her, Castle is going to have to do his best work to get her back on his side.