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According to The Tommy Westphall Universe Hypothesis, nearly all of American television takes place in the mind of an autistic child. The theory first appeared in 2002, when writer Dwayne McDuffie wrote Six Degrees of St. Elsewhere for the Slush Factory.
For those of you don’t know, St. Elsewhere was a slick, well written and acted drama series about the ...
24
Detective John Munch, played by the same actor, Richard Belzer, has appeared in at least a single episode of the following distinct television series, though in some cases, multiple episodes:
"Law & Order: Special Victims Unit"
"30 Rock"
"The Wire"
"Arrested Development"
"Law & Order: Trial by Jury"
"The Beat"
"Law & Order"
"Homicide: Life on ...
17
You've got a lot of properties listed here, so for the sake of clarification, let's break them out.
The Marvel Cinematic Universe (MCU) is where the films produced by Marvel Entertainment / Disney take place. Films include:
Iron Man (1, 2, 3)
Captain America (1, 2, 3)
Thor (1, 2, 3)
The Avengers (1, 2)
The Guardians of the Galaxy (1, 2)
Ant-Man / Ant-Man ...
15
There are the Marvel series on Netflix:
The protagonists from Daredevil, Jessica Jones, Luke Cage and Iron Fist join together on The Defenders, The Punisher spun off from Daredevil and they all share multiple side characters. And of course they all belong to and reference the greater Marvel Cinematic Universe.
14
It’s going to happen with the cooperation of both the studios, it was in talk from long. Discussion was from reboot to sequel. Spider-Man is a big part of Civil War story line, which is happening in Captain America: Civil War.
From Wikipedia Marvel Cinematic Universe page:
In February 2015, Sony Pictures and Marvel Studios announced that Spider-Man will ...
13
Arrow and The Flash are part of same canon called Arrowverse and have crossover almost every year and even more then once sometime:
The Flash S01E01: It's Pilot for the Flash show and Arrow came for a speech/dialogue only and don't have much impact of it on Arrow show itself, You might already know S02E8 and S02E09 of Arrow is kind of backdoor pilot of ...
12
Screenrant answered it pretty well:
Earth 89: Tim Burton's Batman Movies
Tim Burton's Batman films are represented in one quick cameo, which confirmed it as Earth-89. Danny Elfman's familiar Batman theme plays as the Bat-Signal burns bright in the red skies over Gotham City. This is observed by a man in a trench-coat and fedora, who mutters "I hope you'...
9
"Forever Red" from Power Rangers: Wild Force includes characters from 9 shows with speaking roles
To commemorate the 10th anniversary of the Power Rangers franchise, the episode "Forever Red" of Power Rangers: Wild Force featured Red Rangers from every Power Rangers TV show to date teaming up to fight an enemy. Every one of them has speaking roles.
Jason ...
9
You are missing out few, will try to answer in chronology:
From Supergirl S05E08:
Tim Burton's Batman Movies: Alexander Knox (Robert Wuhl) cameo who was the first to report upon The Joker's crimes
Titans: Hawk (Alan Ritchson) and Jason Todd (Curran Walters) cameo
Batman (1966 TV series): Robin (Burt Ward) shouts "Holy Crimson Skies Of Death!"
Freedom ...
8
I've found no references about this anywhere online, so I'm going to say no, they are not (deliberate) references. There are plenty of Easter Eggs that Disney, and Pixar in particular, are famous for. For an example of these, see this link.
However, no member of the production team for any of these films has made any comment about observations like yours, ...
8
From Crisis: Episode 2 (Batwoman)
Earth 74:
Legends of Tomorrow have retired and Mick Rory is left inhabiting the Waverider
Earth 99:
Batman (Kevin Conroy) has retired and can only move thanks to an exoskeleton.
Earth 75:
Superman of this Earth is killed by Lex Luthor wielding the Book of Destiny
Earth 167:
Superman (Tom Welling) has given up his powers and ...
5
I am up to date with only Flash and Arrow
You should be fine.
To date only Flash and Arrow have had the Crisis as a plot point, the other shows have not featured any elements of the proposed crossover although characters from other shows are expected to feature in the crossover episodes.
At best, the pre-crossover episodes of other CW /DC shows have only ...
5
First thing first there is no Crisis on Infinite Earths S01E01? As it's not a different show but a crossover of five existing Arrowverse showa with some extra additions.
First Crisis on Infinite Earths is not limited to The Flash and Batwoman and if you don't know other shows you might end up getting confused. Also, Crisis on Infinite Earths is 5 episodes (...
5
Supergirl happens in one of the various unnumbered parallel universes to The Flash and the Arrow-verse. It is neither Earth-1, where Arrow, The Flash, Vixen, or Legends of Tomorrow occur, nor Earth-2, home to Jay/Zoom, the 2nd Harrison Wells, and Jessie Quick, where technology seems to have taken off decades earlier (Very Zee-Rust).
Update: A season later, ...
5
I hate to send you to a website, but there is a master list of crossover appearances maintained at Poobala. The site is physically elderly, to the extent that it uses frames, and it last had a major update in January 2012, but it is quite comprehensive. There are so many crossovers listed that it would be futility to copy them all over here. The ...
5
Wikipedia has some information about this.
For instance, Detective John Munch from Homicide: Life on the Street (NBC) appeared in an episode of The X Files (FOX).
It's rare, but it happens.
5
Names visible:
Brad Hunter (Comics - appears in 1 issue)
Lacy Warfield (Donnerverse - Superman IV: The Quest for Peace
Mark Spencer (Comics - appears in 6 issues)
Jeff Hage (Comics - 9 issues)
??
Toni Allen
Jennifer Owens (Comics - 13 issues)
Lois Lane
Jimmy Olsen
Jerome Curtis??
??
??
Franklin Stern (Comics - 33 issues)
Perry White
Ron Troupe
Dirk ...
5
They have never been in the same continuity.
Most people assume that they share the same continuity, and particularly that the Doom Patrol episode of the first season of Titans is a backdoor pilot. That's understandable since the show and the episode have mostly the same cast and, according to the Wikipedia article on the show,
On May 14, 2018, it was ...
4
As far as I know, nobody confirmed coming from Earth-199999 have crossed over to other Marvel universes. However, the opposite have happened; according to the Marvel Wikia,
the Young Avengers visited the MCU while looking for the character Speed, in Young Avengers Volume 2 #8. In the same issue there's also an Easter egg, showing Earth-616's Loki's passport ...
4
If we disqualify the Tommy Westphall Universe…
An issue with the Tommy Westphall universe is that many shows are only linked by Easter eggs (e.g. the TARDIS is in the background of a single shot, things like Morley cigarettes or the Yoyodyne company exist), which isn't really in the spirit of the question.
Also, plenty of shows in that universe are not at ...
4
What about the Happy Days Universe?
Happy Days
Joanie Loves Chachi
Laverne and Shirley
Mork and Mindy
Sabrina the Teenage Witch
4
The order is as follows:
Supergirl S3E8 Crisis on Earth-X Part-1
Arrow S6E8 Crisis on Earth-X Part-2
Flash S4E8 Crisis on Earth-X Part-3
Legends of tomorrow S3E8 Crisis on Earth-X Part-4
Then watch Flash Episode 9
4
In The Flash Season 3 Episode 8, Cisco and Barry are trying to recruit Supergirl and Cisco says that the tachyon device tracked Barry to Earth-38 when he visited Supergirl the first time.
3
I watch both shows and have seen both parts of the crossover, you probably can watch it without seeing the previously shown Sleepy Hollow episodes as long as you at least know the rough premise of SH as it was (from what I can tell) intended to act as a way of attracting Bones fans to Sleepy Hollow so while it forms part of the arc for season three it's ...
3
The showrunners of Bones have always been extremely coy about whether those supernatural elements are real, or have a "real world" explanation. You are correct in your assumption that shows like "Hero in the Hold" are intentionally left vague (as are later episodes where, for example, we apparently see a legitimate psychic/medium.)
...
3
Not sure if OP meant that Bones interlinked characters/episodes with the tv show Crossing Jordan, I wasn't aware of crossovers with CSI but maybe I missed them.
Not sure if this counts but Joss Whedon's two shows Buffy and Angel were written in the same universe however at a later time Angel was moved to another television network. This is why there stopped ...
2
Buffy and Angel? Quite a few episodes there.
2
There were the Beverly Hillbillies/Green Acres/Petticoat Junction crossovers in the 1960s.
2
I'm interested in finding out if there have been instances of character crossover in currently running episodes on competing networks?
If you count streaming services are competing for networks too then I will count Crisis on Infinite Earths
In this crossover we have, CW network running shows;
Supergirl (Originally CBS in seaosn 1)
The Flash
Batwoman
...
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