Numbers (season 5)

Don and his team hunt for the killers of two rock climbers found in possession of a large diamond. Charlie decides he should get his FBI clearance reinstated while a new agent joins the team.

First appearance of: Sophina Brown as Nikki Betancourt

After a woman is murdered in what appears as an ATM robbery a series of kidnaps, rapes and murders turns into a hunt for the gang leader. New girl Nikki agrees to be the decoy, and Charlie's involvement leads to trouble for Don.

When eight people, including two LAPD police officers, are executed in a coffee shop, a detective (D. B. Woodside) gets the team on the case, and they uncover a trail of blackmail, romance and corruption. Also, McGowan's (Keith Carradine) investigation of Charlie and Don deepens.

Don's team joins FBI Agent Bloom (Henry Winkler) in tracking an elusive con man. Meanwhile, decisions are announced on Charlie's FBI clearance and disciplinary action for Don.

The team hunts a crew stealing high-end goods from a shipping service and looks to an employee with savant-like abilities to lead them to those behind the scheme.

While on a date, David catches a disappearing act at a magic show but quickly becomes involved in the performance when the magician really vanishes.

One of Don and Charlie's friends dies in what is deemed an accident. Not convinced, the brothers investigate further.

The team is sent to investigate and help with the recovery at a train crash; however, the train is carrying dangerous chemicals.

Note: During its original run, David Krumholtz gave a public service announcement stating that the episode was not in fact based on a similar train crash in the California area that occurred after taping, but before the episode aired.

A bomb goes off during a high profile meeting and a documentary film maker has a conspiracy theory about it.

Charlie and his rival Marshall Penfield race against time to solve a case.

Buck Winters escapes from prison, consumed by getting revenge against Don, forcing Don to face his past and turn to his new-found religious beliefs.

When 18 tourists on a bus are taken hostage, the team has only four hours to stop the hijackers.

An undercover agent disappears, leading the FBI team deep into Chinatown's black market. The FBI gets help from the returning psychic Simon Kraft (John Glover).

When a pair of valuable sneakers is stolen from the vault of a foreign ambassador, the team delves into the world of sneaker collecting.

When Robin's seemingly bulletproof case fails and a dangerous weapons smuggler is released, the team investigates the possibility of jury tampering.

Liz goes undercover in an operation to stop a new illegal drug from hitting the streets after Charlie predicts that the drug in question will be the next "big thing" to hit the drug market. During the operation, David is assigned to be Liz's handler but he grows concerned for her safety after she ignores his plan and begins trusting a fellow undercover agent who may or may not be an addict himself.

The FBI team investigates the death of visionary scientist Daniel Robertson; the prime suspect is Robertson's AI computer program, while Charlie considers an enticing job offer.

The FBI team rushes to track down evidence that could save a mob boss from the death penalty. New information comes in that could exonerate him, leaving the team with only hours to run down the new lead.

With Amita having been kidnapped by the leader of a cult with female followers, the whole team including Ian Edgerton race against the clock to bring Amita home safely before it's too late.