Chicago PD to DC's Legends of Tomorrow
4 connections
Chicago PD
Law & Order: Special Victims Unit
Chicago PD crossover to Law & Order: SVU
Law & Order
SVU was spin off of Law & Order
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
DC's Legends of Tomorrow
Arrow spun off DC's Legens of Tomrrow