Weller joins a film production as their new FBI consultant to get close to the star of the film, Keith Rhodes in episode 3x06 "Adoring Suspect".
From episode 1x08 "Persecute Envoys".
Patterson hops in the truck with Zapata and takes off the old man mask in episode 3x08 "City Folks Under Wraps".
Derek calls John Saya to report on the teams involvement in episode 3x10 "Balance of Might".
The gang says goodbye to Jane and Weller as they leave in their moving truck for Colorado. Later, after they move back to New York, Weller goes outside for some snacks and is approached by Roman in episode 3x01 "Back to the Grind". Weller remembers his conversation with Roman the night before and what he was asked to do in episode 3x02 "Enemy Bag of Tricks".
Blake invites Roman over after the attack and she tells him a true story about her father in episode 3x06 "Adoring Suspect". Roman drives Blake back to her hotel after evading her guard and she invites him to dinner with her father, Hank Crawford, who offers Roman a job in episode 3x08 "City Folks Under Wraps".
The team follows Park & Palmer to a water treatment plant where they are trying to release the virus in episode 3x07 "Fix My Present Havoc".
The team brings Eric Vance with them to talk with Julian Milliken who is leaving town in episode 3x07 "Fix My Present Havoc".