Castle fans have been waiting anxiously for months now for an official Season 5 renewal from ABC. Although another season looks "very likely," according to TV Line, we can't help but worry about the fate of our favorite show. One person who's not panicking? Castle creator Andrew Marlowe. "@AndrewWMarlowe thinking about season 5. (though we're still waiting to hear)," his wife and fellow Castle writer Terri Miller tweeted yesterday, along with a picture of her hubby burning the midnight oil.