Melrose Place (2009) to Star Trek Enterprise

Melrose Place (2009) was a continuation of Melrose Place which was a spin off of Beverly Hills 90210 that was continued as 90210

90210 was a spun off of Beverly Hills 90210

Brenda Walsh picks up a Morley smoking habit while in Paris on Beverly Hills 90210

The X-Files? Cigarette Smoking Man and Buffy the Vampire Slayer's Spike both smoked Morley cigarettes.

Angel was a spin-off of Buffy the Vampire Slayer

John Larroquette Show referenced Yoyodyne. Yoyodyne was also a client of Angel's Wolfram & Hart.

THe John Larroquette Show reference Yoyodyne which is the company that makes some of the starships mentione on Star Trek: TNG

Both part of the Star Trek Universe