Dragnet 67 to Star Trek the Next Generation
12 connections
Dragnet 67
Dragnet
Dragnet spun off Dragnet 67
Adam-12
The main characters from Adam-12 appear as witnesses in an episode of Dragnet
Emergency!
Emergency! had a crossover with Adam-12 to find a boy who ran away from the hospital.
Matlock
Both feature the fictional Trans Global Airlines
Diagnosis: Murder
Diagnosis Murder's Dr Mark Sloan was defended by Matlock when Sloan was accused of murder
Lost
The airplane that crashed and strand the cast of Lost was Oceanic Airlines Flight 815 also featured on Diagnosis Murder.
Veronica Mars
In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.
The X-Files
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."
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
The John Larroquette Show
John Larroquette Show referenced Yoyodyne. Yoyodyne was also a client of Angel's Wolfram & Hart.
Star Trek the Next Generation
THe John Larroquette Show reference Yoyodyne which is the company that makes some of the starships mentione on Star Trek: TNG