Trekverse

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The Trekverse as I call it centers around Star Trek or at least that's where I started. This universe is often put into the Tommy Westphall Universe but that relies heavily on brand connections which I tend to avoid. These brands are often just props shows and movies use or in the case of businesses they use the same fictitious businesses to avoid naming specific banks or airlines for legal reasons.

Onto the Trekverse.

• Star Trek, both the original series and Next Generation featured many references to The Forbidden Planet. Altair IV from that movie gets brought up a lot
• Star Trek has had several spin-offs including: Star Trek: The Next Generation, Star Trek: Deep Space Nine , Star Trek: Voyager, Star Trek: Enterprise, Star Trek: Discovery, Star Trek: Picard, Star Trek: Strange New Worlds. Theres also animated series but their canonicity is questionable.
• In Red Dwarf we see a Klingon ship in the episode Psirens.

Now in the same episode we also see a ship from Space:1999 and a Weyland-Yutani ship from Aliens. Now...im going to dismiss those two, the klingon ship i can sort of fit that in but the others not so much Space: 1999 the moon goes out of orbit, that doesnt really fit and unlike a dreamworld which the Trekverse isnt there has to be at least somewhat cohesive structure. As for Weyland-Yutani, its just such a go to reference that its hard to really say what is and isnt a link with that, it would need more for me consider it a link. Same reason why im not including the Slusho reference from the 2009 Star Trek film. The Slushoverse warrants its own post in the future.

• Dr. Jackson Roykirk who made the space probe that appeared in the Star Trek episode "The Changeling" appears in an episode of Team Knight Rider
• Team Knight Rider is a follow up to Knight Rider.
• Knight Rider had some spin-offs including Code of Vengeance, the tv movie Knight Rider 2000, the film Knight Rider from 2008 and subsequent tv series Knight Rider (2008)
• In Herbie: Fully Loaded a news story reports that Herbie hangs out with K.I.T.T from Knight Rider. The Herbie series of films has 6 films. The Love Bug, Herbie Rides Again, Herbie Goes to Monte Carlo, Herbie Goes Bananas, Disney's The Love Bug and of course Herbie: Fully Loaded
• In the 2008 film Knight Rider, the characters go to the Montecito Resort and Casino from Las Vegas. While this is a brand link i think its substantial enough given the characters actually go to it, its a location and its not a reference that is a go-to like Weyland-Yutani or Morley.
• The Montecito Resort and Casino shows up also in Passions, Medium and Heroes.
• Las Vegas had a crossover with Crossing Jordan
• The Dunder-Mufflin company from The Office (US) is mentioned in an episode of Las Vegas.
• The Office (US) had an appearance of David Brent from the The Office (UK) the original British version of the Office.
• David Brent: Life on the Road was a spin-off film of the The Office (UK)
• Sabre Printers from The Office appears in Parks & Recreation, Most likely intentional as the shows were both created by Micheal Schur.
• The Swanson Safe Company appears in The Good Place and Rutherford Falls, also created by Micheal Schur so im fairly certain that was intentional link to Parks & Rec. Theres also other brand links.
  
• Dr.Bombay from Bewitched was a character in Passions
• Tabitha Lennox mentions having an affair with Barnabas Collins from Dark Shadows
• Phoebe Figally from the Nanny and the Professor is a character in Passions.
•  Uncle Dale from the 12 Monkeys tv series appears in both Star Trek: Picard and MacGyver (2016).
• MacGyver (2016) crosses over with the reboot of Hawaii Five-0.
• The Hawaii Five-0 (2010) crossed over with NCIS: Los Angeles and Magnum P.I (2018)
• NCIS: Los Angeles crossed over with Scorpion
  
• NCIS: Los Angeles is a spin-off of NCIS
• NCIS spun off NCIS:  New Orleans and NCIS: Hawai'i
  
• NCIS is a spin-off of JAG
• Edward Sheffield from First Monday joined the series JAG
  
• Belgravia, a fictional country which appears in an episode of NCIS is also seen as the setting of The Princess Switch, The Princess Switch: Switched Again, The Princess Switch 3: Romancing the Star as well as A Christmas Prince: The Royal Baby. Belgravian royalty appear in the 1931 musical Honeymoon Lane. Belgravia originates from the 1926 film Young April

The Trekverse as outlined here includes 37 TV shows and 16 movies ranging from 1926 all the way to shows still ongoing.