At the close of one of the missions, what appears to be a Shadownet operative,dressed similarly to Splinter Cell protagonist Sam Fisher, boards the same chopper as the player-character. In Chaos Theory it is revealed there are many more splinter cells other than Fisher and Tom Clancy's games are known to cross-reference each other. Also, there are several instances where the player will see an arcade game of Chaos Theory during several missions and on numerous multiplayer maps.