The Couple in the Cave

A couple's remains that are discovered in a National Park cave create a double mystery: who are they and why were they killed? Elsewhere, Booth's girlfriend drops by, unexpectedly stateside from her assignment as a correspondent in Afghanistan, which leaves Brennan unsure of her relationship with Booth.

Season 6 | Episode 2

Emily Deschanel

Dr. Temperance "Bones" Brennan

David Boreanaz

Agent Seeley Booth

Michaela Conlin

Angela Montenegro

Eric Millegan

Zack Addy

T.J. Thyne

Dr. Jack Hodgins

Tamara Taylor

Dr. Camille Saroyan