M*A*S*H to Red Dwarf
6 connections
M*A*S*H
St. Elsewhere
St Elsewhere's Mark Craig talked about M*A*S*H's BJ Hunnicut.
Homicide: Life On The Street
St Elsewhere's Dr Turner was investigated for murder by Homicide's Pembleton and Bayliss.
The X-Files
Homicide's John Munch questioned The X-Files' The Lone Gunmen.
Buffy the Vampire Slayer
The X-Files? Cigarette Smoking Man and Buffy the Vampire Slayer's Spike both smoked Morley cigarettes.
Angel
Angel was a spin-off of Buffy the Vampire Slayer
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.