In the House to The Flash
11 connections
In the House
The Fresh Prince of Bel Air
In the House's Tiffany's boyfriend cheats on her with The Fresh Prince of Bel Air's Ashley. Also Carlton and In the House's Marion are friends
The Jeffersons
The Jefferson family appeared on the final episode of Fresh Prince where they purchased the house from the Banks family.
Mission: Impossible (1966)
George Jefferson gets help from Barney Collier from Mission Impossible
Mission: Impossible (1988)
Mission: Impossible was continued 22 years later
Diagnosis: Murder
Diagnosis Murder's Doctor Jesse Travis's father is a spy that someone is trying to kill. One of the possible suspects is the original Mission: Impossible's Cinnamon Carter.
JAG
Oceanic Airlines
NCIS
NCIS was a spinoff of JAG
NCIS: LA
NCIS: LA was a spinoff of NCIS
Hawaii Five-O (2010)
NCIS: LA and Hawaii Five-O worked together in a crossover episode to stop a smallpox outbreak
Arrow
Hawaii Five-O references Dominic Alonzo from Arrow
The Flash
Arrow spun off The Flash