Billy Dec

The gang decides to go out to Las Vegas to surprise Joey and to celebrate Monica's and Chandler's one-year anniversary.

Ross worries when his student/girlfriend goes on vacation with her wild friends.

A child reappears one year after he went missing -- but the team must work quickly when a trick-or-treater disappears under similar circumstances.

Lt. Boden (Eamonn Walker) and Jimmy (Steven R. McQueen) find themselves at odds in dealing with the aftermath of recent events while Kidd (guest star Miranda Rae Mayo) is forced to deal with her unstable and volatile ex, Grant (guest star Guy Burnet). With the help of firehouse 51, Dawson (Monica Raymund) tries to put her best foot forward in her pursuit for fostering Louie.

With production on his next film delayed, Vince searches for ways to amuse himself.

Special Agent Cuyler (Adam Arkin) comes to see Superintendent Colvin; Jarek tries to address his family issues; the case against Chicago's kingpin of corruption comes to an end.