Medical Investigations to The D.A.
13 connections
Medical Investigations
Miss Match
A sick suspect on Third Watch triggers an investigation by the characters from Medical Investigation.
Boston Legal
Judge Isabel Hernandez from Miss Match also appeared on an episode of Boston Legal.
Cheers
Ivan Tiggs and Shirley Schmidt from Boston Legal go out to diner at Melville's restaurant from Cheers
St. Elsewhere
St Elsewhere's Westphall, Craig and Auschlander visited Cheers' bar
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.
Veronica Mars
The mugshot of Malcolm T Wiggins from the X-Files episode "Titonus" appears on the wall of a police interrogation room in the Veronica Mars episode "Leave it to Beaver." Also the fictional car rental company Lariat where Mulder & Scully always rented their cars was featured prominently on the Veronica Mars episode "Rat Saw God."
Lost
In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.
Diagnosis: Murder
The airplane that crashed and strand the cast of Lost was Oceanic Airlines Flight 815 also featured on Diagnosis Murder.
Matlock
Diagnosis Murder's Dr Mark Sloan was defended by Matlock when Sloan was accused of murder
Emergency!
Both feature the fictional Trans Global Airlines
Adam-12
Emergency! had a crossover with Adam-12 to find a boy who ran away from the hospital.
The D.A.
Adam-12 had a two part crossover with The D.A.