Andy Barker, P.I. to Millennium
3 connections
Andy Barker, P.I.
Buffy the Vampire Slayer
Guy Helverson from Andy Barker, P.I. owns a Doublemeat Enterprise from the Doublemeat Palace episode of Buffy
The X-Files
The X-Files? Cigarette Smoking Man and Buffy the Vampire Slayer's Spike both smoked Morley cigarettes.
Millennium
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.