Millennium to The Wire
3 connections
Millennium
The X-Files
The X-Files' Jose Chung was also investigated by Millennium's Frank Black and later X-Files' Mulder and Scully meet Millennium's Frank Black.
Homicide: Life On The Street
Homicide's John Munch questioned The X-Files' The Lone Gunmen.
The Wire
On The Wire (episode "That's Got His Own") Junior Bunk from Homicide was mentioned as someone who had once put bad drug product on the market causing deaths.