Writer:	Andrea Newman
Director:	Paris Barclay
Star:	Thom Barry (Det. Will Jeffries),  Tracie Thoms (Kat Miller (Episodes 3.13+; recurring previously)),  John Finn (Lt. John Stillman),  Kathryn Morris (Det. Lilly Rush),  Jeremy Ratchford (Det. Nick Vera),  Danny Pino (Scotty Valens)
Guest Star:	John Rubinstein (Rafe Gray (2002/2006)),  Aisha Jamila Francis (Kit Kat Girl),  Cameron Covell (Young Boy),  Donna Pieroni (Robin),  Timilee Romolini (Gloria (2002/2006)),  Judi Barton (Della Gardner),  Dwayne L. Barnes (Clinton (2002/2006)),  Eric Lange (Lyle (2002/2006)),  Laura Bell Bundy (Nora McCarthy (2002/2006)),  Yvette Tucker (Kit Kat Girl #2),  Adam Pascal (Dennis Hofferman),  Nancy O'Meara (Kit Kat Girl #3),  Tyce Diorio (Kit Kat Boy #3),  Matthew Shaffer (Kit Kat Boy #1),  Anthony Marciona (Kit Kat Boy #2),  Gigi Hunter (Kit Kat Girl #4),  Rita Bland (Kit Kat Girl #5 (as Rita Maye Bland))

International Airdates:
- Denmark: May 3, 2006 on TV3+ (edit) In the casting sides and in the CBS press release for this episode, Dennis' last name was Hirschfelder and Della's (the local community theater owner in the beginning of the episode) last name was Morris. These were later changed to Hofferman and Gardner, respectively. (edit) This is the second time all the music in the episode is taken from a single musical. The first time was episode 2-21: Creatures of the Night, with music from the 1975 movie version of the musical The Rocky Horror Picture Show. (edit) All the songs in the episode are taken from the musical Cabaret. The songs not performed by any of the actors in this episode are taken from the cast recording of the 1998 revival, starring Alan Cumming as Emcee and Natasha Richardson as Sally.

- Willkommen, performed by Alan Cumming
- Entr'acte, performed by The Kit Kat Band
- Don't Tell Mama, performed by Laura Bell Bundy and Dwayne L. Barnes
- Perfectly Marvelous, performed by Laura Bell Bundy and Adam Pascal
- Maybe This Time, performed by Laura Bell Bundy
- Married, performed by Adam Pascal
- If You Could See Her, performed by Alan Cumming
- Tomorrow Belongs to Me, performed by Cameron Covell
- Maybe This Time, performed by Natasha Richardson
- Cabaret, performed by Natasha Richardson (edit) The episode title, Willkommen, means "welcome" in German. (edit)

Lilly: (about Rafe) We could bring him in right now for buying the gun.
Kat: Might help him "tap into" the emotions of jail time. (edit) Lilly Rush: Twenty bucks on the director as the doer. Biggest liar, biggest ego. (edit) Nick Vera: (humming) Come to the Cabaret...
Lilly Rush: I hate musicals.
Nick Vera: Well, you wouldn't if you'd seen me as Danny Zuko in my eighth grade production of Grease. Brought the house down. (edit)

We learn that in the eighth grade, Det. Vera played Danny Zuko in the school's production of Grease -- something you would not expect from the surly detective. (edit) Dennis Hofferman was killed in May 2002. (edit) We find out that Lilly doesn't like musicals. (edit)

Cabaret
The theater group is doing the musical Cabaret, which opened on Broadway in 1966. All the songs in the episode are taken from the musical, including the title song Willkommen. It is also the same song Dennis performs when he auditions. (edit)