An escaped lion puts lives and relationships in danger; Lexie hears Mark talking about moving in with Julia; Teddy begins to come to terms with Henry's death; Callie asks Arizona about her past relationships.
The team investigate the discovery of a corpse that has been dyed in a blue substance. Meanwhile, Booth tries to boost Bones' confidence.
Deeks is forced to assume an old alias, in order to protect his best friend and chief informant from arms traffickers. Things begin to get personal.
An undercover DEA agent suspects she has been dangerously exposed to methamphetamine when she starts to show symptoms of poisoning.
Hank attends a secret meeting in Manhattan; Evan and Jeremiah treat an internet entrepreneur; Divya reconciles with her father.