TV insiders say the next episode of The Big Bang Theory (February 19, 8pm on CBS) is going to be a tearjerker. Hint: Howard (Simon Helberg) gets some unsettling news. But rest assured there will be comedic relief. Fans get to watch Sheldon (Jim Parsons) do laundry and see Penny (Kaley Cuoco-Sweeting) lose her cool when she learns something maddening about Amy (Mayim Bialik).
But the icing on the comedic cake is going to be a cameo appearance by Castle star Nathan Fillion. Raj (Kunal Nayyar) and Leonard (Johnny Galecki) run into a restaurant customer who "looks a lot like the actor Nathan Fillion."
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