Episode #4.1 = Trust Metric


The team races against time to recapture Colby after he and Dwayne escape from custody.
Special Guest Star: Val Kilmer
NOTE: Tony Scott, director of Top Gun and this episode, really DID go and change EVERYBODY's hair!

Episode #4.2 = Hollywood Homicide


A girl is found dead in a rising Hollywood star's bathroom, and several twists uncover a pirating operation and a deep cover-up. Meanwhile, Colby returns to work and Aya Sumika reprises her role as Liz Warner.
Special Guest Star: Aaron Stanford

Episode #4.3 = Velocity

A street racer slams into a coffehouse, killing one man. The case takes the team deep inside a very Fast-And-The-Furious type world.

Episode #4.4 = Thirteen

The team hunts down a serial killer who is recreating the deaths of the Biblical apostles.
NOTE: We learned about Megan's secret assignment. It appeared as though the DOJ was using her profiling skills to torture people.

Episode #4.5 = Robin Hood

A robber breaks into a high security bank and gives all the money to charities. The case turns into smuggling and the drug trade.

Episode #4.6 = In Security

A woman that Don was protecting for the Witness Protection Program is murdered, and she wasn't the only one keeping secrets. What's Don hiding?

Episode #4.7 = Primacy

An alternate-reality game leads to the death of one of its players. Amita, who plays the game, becomes the key to solving the case, much to Charlie's dismay.

Episode #4.8 = Tabu


Episode #4.9 = Graphic

A rare first-edition comic book is stolen from a convention.
Special Guest Stars: Christopher Lloyd and Wil Wheaton

Episode #4.10 = Chinese Box

A former FBI subcontractor guns down an agent inside the agency's headquarters and takes a member of Don's team hostage.
Special Guest Star: Enrico Colantoni

Episode #4.11 = Breaking Point

An investigative journalist goes missing, and Charlie is physically intimidated in an effort to disrupt his work on the case.

Episode #4.12 = Power

Don's team tracks a serial rapist who uses his position as a cop to entrap his victims.

Oh no! Was this already the end of Season 4? Heavens no! Those writers got what they wanted and WE GOT SIX MORE EPISODES!

Episode #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.

Episode #4.14 = Checkmate

Don runs into Robin Brooks during an investigation concerning informants and a chess master.
Special Guest Star: Michelle Nolden

Episode #4.15 = End Game (it is best to watch "Thirteen" first)

Don and his team hunt for an ex-Marine wanted for murder. Things become confusing, however, when the Marine's family is kidnapped. Is there more to this case than meets the eye?
Special Guest: Bill Nye, Aya Sumika (!), Michelle Nolden

Episode #4.16 = Atomic No. 33

Don and the team must investigate a religious cult after scores of followers are poisoned.
Special Guest Star: Michelle Nolden

Episode #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.
Special Guest Stars: Three 6 Mafia, Aya Sumika

Episode #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.
Special Guest Stars:

The DVD set containing all 18 episodes was released on September 30, 2008.

Thanks to Numb3rs Online for the screenshots!
Thanks to TV.com for (most) of the summaries!