Hey hey, Castle fans! Jager here from Wetpaint Entertainment, with news of a family reunion. Word on the street is, we may meet Castle's dad this year. Who could be charming enough to have swept Martha off her feet and smart enough to produce Castle, yet diabolical enough to abandon him while he was still a wee little cottage? Nathan Fillion has his own casting ideas in mind he wants William Katt, AKA The Greatest American Hero, to take on the role. But I've got a few other suggestions.