Angela, Hodgins, and Cam find themselves looking back at a prior serial killer case for their investigation, and everyone is a bit on edge.

Freddie Prinze, Jr. returns to Bones as CIA Agent Danny Beck in "The Source in the Sludge."

Booth (David Boreanaz, R) and FBI Special Agent James Aubrey (John Boyd, L) follow a lead to a remote location in the "The Lost Love in the Foreign Land."

Turns out that Brennan has a surprise for everyone else at her birthday party on Bones. "The Brain in the Bot" is the second episode of the show's 12th season.

Brennan (Emily Deschanel, L) and Booth (David Boreanaz, R) discuss their current case in the "The Money Maker on the Merry-Go-Round"

Booth and Brennan investigate the death of a public defender on Bones. "The Death in the Defense" is the 11th episode of the show's 11th season.

Aubrey and Booth are on the case to find out who killed the teacher.

Cam and Fuentes and suited up as they review remains.

The team (L-R: Guest star Michael Grant Terry, TJ Thyne, David Boreanaz, Emily Deschanel and Tamara Taylor) examines the remains of a body found in a stairwell at a forensic science convention in the "The Corpse at the Convention."

Booth lowers Brennan down a large construction chute on Bones. Obviously.

Brennan supports Booth as he prepares to enter the subcommittee hearing in "The Recluse in the Recliner."

Cam and Arastoo celebrate Booth and Brennan's wedding on Bones. "The Lady in White" is the sixth episode of the show's ninth season.