Oz to The Flash
4 connections
Oz
Homicide: Life On The Street
Homicide's detectives watched Oz's Miss Sally on TV.
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