Numb3rs 4×18: When Worlds Collide
In the season finale, Don and Charlie work together on a case that ends up with them going head to head about their personal beliefs, and one team member will walk away forever.
Numb3rs 4×17: Pay to Play
When a musician is murdered, Don and his team must race to find the culprits. They need Charlie’s help, but he is busy with Amita’s parents coming for a visit.
Numb3rs 4×16: Atomic No. 33
Don and the team must investigate a religious cult after scores of followers are poisoned.
Numb3rs 4×15: End Game
Don and his team investigate the kidnapping of the family of a Marine. Turns out, however, that the Marine is running from the law. A chicken-and-egg hunt ensues when the FBI searches for the fugitive Marine who is searching for his family.
Numb3rs 4×14: Checkmate
Don runs into Robin Brooks during an investigation concerning informants and a chess master.
Numb3rs 4×13: Black Swan
Don and the team bust a meth lab, but when Don has a feeling there’s more to the organization than just what’s on the surface, his intuition is put to the test.
Numb3rs 4×12: Power
A bad case becomes worse when Don and the team must pursue a police officer believed to have committed unspeakable crimes.
Numb3rs 4×11: Breaking Point
Charlie’s life is put in danger when Don brings him in on the case of a missing reporter.
Numb3rs 4×10: Chinese Box
Don and the team are left with little recourse when a former FBI subcontractor takes a team member hostage.
Numb3rs 4×9: Graphic
The team investigates the theft of a graphic comic book.






















