* The X-Files4th season episode "Never Again": Agent Scully goes to a tattoo parlorwhere she selects a tattoo called an Ouroboros, a depiction of aserpent, coiled into a circle, eating its own tail. This emblem is thelogo for the Millennium and the fictional group after which the programis named. The episode was written by Glen Morgan & James Wong, whocontributed heavily to Millennium.
* The X-Files seventh season episode "Millennium": Lance Henriksen andBrittany Tiplady make their final appearances as Millennium charactersFrank and Jordan Black. Millennium had been canceled earlier that year,after its third season.
* Millennium first season episode "Lamentation" (written by ChrisCarter): The main character, Frank Black, visits the FBI building andMulder and Scully are briefly seen descending a stairway. In fact, theyare Duchovny and Andersons' stand-ins.
* Millennium second season episode "Jose Chung's Doomsday Defense": Thewriter Jose Chung appears, who was first seen in the The X-Filesepisode, "Jose Chung's From Outer Space". Both episodes were written byDarin Morgan.
* Millennium second season episode "The Time Is Now": Character PeterWatts (Terry O'Quinn) picks up a "Morley" cigarette butt, indicatingthat the nefarious X-Files character, Cigarette Smoking Man, has beenlurking in the vicinity recently.