Sean, Julia and Christian struggle to find a common solution as Matt spirals out of control; Christian helps out his old fraternity after a hazing incident.
A human jawbone found at the Jeffersonian alerts Brennan and the team that the Gormogon serial killer has struck again; a lab explosion lands Zack in the hospital; Gormogon's silver skeleton disappears from the vault.
As Valentine's Day approaches, Ryan worries that the pressure of the holiday will ruin his relationship with Taylor.