Suddenly, the cancer-induced ghost sex Izzie was partakinng in on Grey's Anatomy isn't looking so silly. This may, David Boreanaz's alter ego on Bones will suffer a life-threatening health crisis that causes him to hallucinate a visit from Family Guy's acid-tongued baby villain, Stewie. Top that Shonda Rhimes!


"This is going to sound odd, but it is a completely believable event," maintains executive producer Stephen Nathan. "There are conditions where you can see cartoon characters. There's medical research to back up what's going on with [Boreanaz's Agent Booth]." (Nathan would not, however, reveal just what condition will befall Booth.)

Don't expect to see Emily Deschanel's Brennan sparring with the evil tot: The cartoon crossover will be limited to Boreanaz. "We were never going to have Stewie just walk into the lab and start talking to everybody--that would be a bald and shameless crossover," Nathan adds with a chuckle. "It was always conceived to be a realistic hallucination...one that would lead us to what we wanted to do with Booth and Brennan."

In case you've been living under a rock without Wi-Fi, what they want to do is get the two detectives in bed by the May 14 season finale. But first, Brennan will ask Booth to father her child on May 7, a request that leads to Stewie's initial appearance. "Stewie will be in the sperm donation room with Booth," explains Nathan, who says Family Guy creator Seth MacFarlane will sign off on all of Stewie's dialogue. "Whatever Seth wants to do is fine. As far as I'm concerned, he can have Stewie sing."