Bones: Season 4, Episode 16

4 - 16: The Bones That Foam

A bungee-jumping couple plunged off of a hot-air balloon after getting married only to come face-to-face with a corpse lying at the bottom of the gorge. After ruling out suicide, Brennan, Booth and the Jeffersonian team try to determine the cause of death. When they notice an unknown substance oozing from the body, the lab is thrown into immediate lock down, and they realize they have only 24 hours to unravel the mystery before the bones disintegrate.