CSI: New York to The Flash
7 connections
CSI: New York
CSI: Miami
CSI: New York was a spin off of CSI: Miami
CSI: Crime Scene Investigators
CSI:Miami was a spin off of CSI
The X-Files
Morley cigarettes are smoked by Warrick Brown in a episode of Crime Scene Investigation.
Homicide: Life On The Street
Homicide's John Munch questioned The X-Files' The Lone Gunmen.
Law & Order
Law and Order and Homicide crossed over on four episodes
Arrow
Hudson University is the fictional University where many Law & Order characters graduated as well as the location of F.I.R.E.S.T.O.R.M. On Arrow
The Flash
Arrow spun off The Flash