The BAU fly to Colorado when the locals receive a blast from the past and find a rotting skull inside a time capsule buried 25 years ago.
After a Navy officer is found dead on a rural road, the NCIS team must ascertain if the murder was the result of a bar fight or because he knew too much about an attack on a fellow female officer.
Callen and Sam slip on their prisoner/guard guises in order to infiltrate a white supremacist group who have got their hands on stolen nuclear material. Pulling off the biker gal look, Kensi inks up to play Callen's girlfriend.
Jane worries for Lisbon's safety when the team puts itself in the line of fire to protect the witness in a murder investigation from a skilled assassin.
Sue performs a seance with her friends, and the football team tries to stop Axl from attending the Halloween party in his room.