Nathan Fillion Instagram – As I’m sure you know, tonight is the season four finale of @therookieabc. What you may not know, is how lucky we are to have so many incredible guests bringing back their brilliant characters. You know them, you love them, you miss them. They’re back. And will Tim and Lucy finally do something about all this tension?? Jeez, right?? Don’t miss it. You won’t get another fix for a while.