Turtles Forever/Fridge

Fridge Brilliance

 * The original Mirage Turtles don't seem to have a specific characterization in this film, seeming to be nothing but Grim and Gritty Bad Asses, until you hear the Shredder call them "The Prototypical Turtles", it makes sense, the Mirage Turtles we see in this aren't exactly the ones from the comics, but the ones from issue #1, explaining why they all don't have much of a consistent characterization.
 * Also, the slideshow of The Multiverse, showing the grim but popular '03 episode "Same as it Never Was". Seems like it will cause continuity problems, until you see that they were actually trying to fix such problems, since said episode would contradict Fast Forward!
 * Turtles Forever. Indeed, the best way to say farewell to the Mirage-owned franchise. The Title Drop down the line just made it even better.
 * Amidst those listed on that page (and then some more) who had direct interactions with the Turtles, the Archie Comics and Usagi Yojimbo crossovers all involved Alternate Universes. Utrom Shredder wasn't trying to destroy the entire multiverse, but only the segment of it which had versions of the TMNT, who all spawned from TMNT Issue #1. (On the other hand, the Power Rangers in Space crossover with the TMNT? Took place in the main Power Rangers universe...)
 * Also, the fact that The Multiverse can be destroyed by anyone just by In other words, you don't need any superpowers to be an Omnicidal Maniac...
 * Technically,
 * The supposed exaggerated cowardice of the 1987 Turtles is actually Fridge Brilliance. Given their awareness of the fourth wall--they, on various occasions, knew they were in "episodes", and even mentioned that they were the show's title. The '87 Turtles were never afraid where they came from because they were the main characters of the show, they knew they would live. Now in Turtles Forever, they were outside of their show and comfort zone- and indeed could really be killed, due to S&P changes and etc.
 * Also, the exaggerated cartoonyness of the '87 world and characters. The original series was always cartoony, but the first seasons were actually fairly serious, only to Flanderize and become sillier and sillier as they show went on (Though not to the level they were here): But even after the show stopped airing, the universe continued to get zanier, til' they reached the level they were at in the movie.
 * Actually, the original show had at least a few episodes that were more zany than what happened in the movie. The only real notable thing that seemed out-of-character was
 * Refer to the previous bullet point.
 * Also, Old Toon Don was more or less Deus Ex Machina-Man.
 * He pretty much filled that role in the original cartoon though, so it kind of works out.
 * It was a bit out of character for them not to take anything seriously too, at least with Leonardo and Donatello.

Fridge Logic

 * So...The Turtles and The Multiverse, eh? What about Dimension X? The Battle Nexus? Are there Ninja Turtles there, too?
 * No, but Mikey is Battle Nexus CHAMPION!
 * This Troper doesn't think Dimension X is a completely separate universe, "just" another dimension that's attached to the "main" 1987 universe. Like how Marvel's Dark Dimension is not a separate alternate universe, but more of a parasite universe.
 * Try watching this movie right after Back to the Sewers' last episode. With the Technodrome's rampage on modern New York, you had to wonder...where is the Justice Force?
 * Why is Bebop's human form shown walking the streets of the 87 TMNT universe?
 * Perhaps as a Shout-Out to the animation errors in the earlier seasons of the cartoon series?
 * Where the heck is Serling? And Dr. Chapman?

Fridge Horror

 * After reading on Canon Welding, one realizes that 2003 Shredder would have potentially erased a bit more than just Turtle universes...
 * The only other universe lost would've been the Raving Rabbids universe. Turtles Forever treats Next Mutation as non-canon, so any universes linked to that are safe.
 * This establishes that if the Ninja Turtles in Turtle Prime die,it will trigger the destruction of the Ninja Turtles multiverse.The Ninja Turtles aren't immortal,and they'll eventually die of age.Think about that...
 * Refer to the second entry point on this page. The turtleverse was only vulnerable at that specific point in time, which is why Shredder traveled to that point.
 * So they're just going to let '87 Shredder go back to the '87 universe with the upgraded and pimped-out Technodrome capable of destroying universes?
 * And Elite Mooks
 * '87 Shredder is kind of an idiot, remember. Note how he's taunting them with some kind of laughter ray even as he goes into the pimped-out Technodrome.