First Aired: Nov. 05, 2009 on FOX
Summary: Human beings are reduced to ash statues and Broyles realizes that the same person responsible murdered five other persons four years ago... a case that he never solved.
Main Characters in this Episode
Dr. Walter Bishop: Titanium tetrachloride... you sly temptress.
- Goof (continuity error): When Senator Van Horn's and Broyles meet in the park, there is a man on a red bicycle passing by them twice in a eleven seconds. Same direction, left to right.
- Goof (continuity error): When the body of the character Randy is shown before and after combustion, his hands (thumbs in particular) have changed position.
- The "Mystery Molecule" is made up of a heme molecule, which is the part of hemoglobin which contains the iron atom necessary to transport oxygen.
- The Observer walks from left to right at the back when Agent Broyles reports the CIA situation to Agent Dunham by cellphone.