Cheers to Doctor Who (1996) [pilot only]
5 connections
Cheers
Frasier
Cheers spun-off Frasier
The John Larroquette Show
John Larroquette Show's John Hemingway called into Fraiser's show
Angel
John Larroquette Show referenced Yoyodyne. Yoyodyne was also a client of Angel's Wolfram & Hart.
Red Dwarf
In the Red Dwarf episode "Psirens", the crew of the Red Dwarf come across a space ship graveyard which includes a Weyland-Utani ship, connecting it with Angel.
Doctor Who (1996) [pilot only]