It's all about fatal attraction in the next episode of "Bones". Booth's girlfriend and Afghanistan war correspondent, Hannah Burley (guest star Katheryn Winnick), makes a surprise visit. After meeting Burley and sensing the couple's genuine happiness, Brennan re-evaluates her own relationship with Booth, and he tries to teach her that love is not always logical.

Playing the 'other-woman' card, executive producer Stephen Nathan explained, "We are not playing a jealous triangle. I can tell you that categorically. This isn't high school. It won't be two women fighting over the same man. There's no outward tension."

Also in the episode called "The Couple in the Cave", when the remains of a couple are discovered in a cave at National Park, the team must piece together the identity of the man and the woman as well as solve the crime. After interrogating two viable suspects, the team identifies the woman as a marketing executive who also served as her partner's AA sponsor, providing clues that lead them to expose the truth.

"Bones" will be followed by a new episode of "Fringe" simply called "The Box". The story alternates to the Fringe Team "over here" where they investigate a mystifying case that people are discovered in a trance-like state that ultimately leads to their death. The unlikely suspect: a mysterious box.

As Peter and Walter collaborate to study its properties, alternate Olivia presses on and turns up the heat on an unsuspecting Peter. Meanwhile, key information about the future is revealed when Walter and Nina meet at Massive Dynamic for the emotional reading of the last will and testament of William Bell.

"Bones" and "Fringe" return on Thursday, September 30 at 8/7c and 9/8c respectively.