Firefly to Wings
4 connections
Firefly
Angel
Weyland-Utani is a client of Angel's Wolfram & Hart and also the company that made some of the weapons used by Firefly's Malcolm Reynolds in the Battle of Serenity
The John Larroquette Show
John Larroquette Show referenced Yoyodyne. Yoyodyne was also a client of Angel's Wolfram & Hart.
Frasier
John Larroquette Show's John Hemingway called into Fraiser's show
Wings
Dr. Crane from Frasier visited the Wings' airport