* Castle (10:02/9:02c ABC)
She's a hard-nosed detective. He's a charmingly irreverent crime novelist. Surely this partnership can't last for long. Or can it? After all, the show is premised on their unlikely pairing. Things could change tonight, however, when Debi Mazar dances her way onto set to play Castle's agent and she brings with her an offer that may be too good for him to pass up. The catch? It could mean the end to Castle's days of derring-do as Beckett's partner, and that would certainly be a crime.
* Bud Greenspan Presents: Beijing 2008 - America's Olympic Glory (7/6c Showtime)
Those who have seen previous documentaries on Olympic Games from Emmy and Peabody award-winning filmmaker Bud Greenspan will know what to expect. For those who haven't: These are profiles of athletes that follow their stories from preparation for competition through the final results, focusing on the attributes that make them Olympians. This film from the 2008 Summer Olympics in Beijing includes such U.S. standouts as gymnast Nastia Liukin, fencers Keeth and Erinn Smart and swimmer Jason Lezak.
* House (8/7c Fox)
House and company won't be back until November, so if they want to get a Halloween episode in this year it had better be now. Sure enough, House sees ghosts (confronts them, anyhow) while Chase's loose ethics are coming back to haunt him (and messing things up with Cameron). Tonight's patient is a cop with heart-disease worries. Actually, he doesn't have heart disease, but he wants to be treated for it because his father, grandfather and great-grandfather all died from it when they were 40.
* The Big Bang Theory (9:31/8:31c CBS)
Wil Wheaton is known for his role as Wesley Crusher on Star Trek: The Next Generation, but, when he makes an appearance on tonight's episode in a cameo, Sheldon hopes to make him the "crushed." It seems that Sheldon harbors an undying resentment for Wheaton that goes back to his childhood. So, when he hears that his nemesis is competing in a trading-card game, he relishes the chance to compete with him.
* CSI: Miami (10/9c CBS)
Adam Rodriguez's tenure on the series is rapidly coming to an end. The actor, recently seen in Tyler Perry's I Can Do Bad All by Myself, will soon join the cast of Ugly Betty as an old high-school flame of Betty's sister, Hilda. Tonight, Rodriguez - er, make that Delko - starts making his exit strategy, which becomes apparent to Calleigh. The central story focuses on a lethal outbreak in Miami that is investigated as murder. And there's good news for Khandi Alexander fans. The actress, once a series regular, returns tonight to help with the case. - Tim Holland