During season 03 of the 1987 TMNT show, the Technodrome is said to be in the center of the earth (Though statements of the characters keep contradicting it, but other times they say they're in the center anyway)
But in some episodes, Shredder's foot soldiers are outside of the technodrome in the center of the earth:
GojiBoyForever wrote: Classic TMNT needs revisions in general. Shredder beat up Nickoledeon Beebop and Rocksteady with ease.
Wouldn't that count as crossover scaling though?
No, TMNT has a infinite multiverse and they have crossed over twice. In fact I think OG Krang's Dimension X is the Dimension X in the Nick show.
That kind of logic though can mean that almost every incarnation of TMNT scales to almost every incarnation of TMNT because they've all met at some point or another.
2012 TMNT scales to 1987 TMNT because of the crossover episodes.
1987 cartoon TMNT scales to Mirage comic and 2003 TMNT and Mirage TMNT because of Turtles forever.
Mirage TMNT scales to Dark Horse (Canon) Usagi Yojimbo because they've had several crossovers in the comics and have acknowledged prior meetings when ever they've met again. (Mirage Usagi and Mirage Leo have on several occasions.)
Dark Horse (Canon) Usagi Yojimbo scales to IDW TMNT because Usagi Yojimbo acknowledged the IDW turtles as being a different set of characters from the Mirage Turtles who he met prior.
All in all thise would mean that 1987 TMNT, 2003/4KIDS TMNT, 2012 TMNT, Mirage Comic TMNT, IDW TMNT, and Dark Horse Usagi Yojimbo all scale to one another.
The big problem with this is that the crossover with the 2012 series (Trans-Diemsnional Turtles) completely contradicts the 'Turtles Forever' Crossover.
In Turtles Forever, the Classic Turtles and 2003 turtles go to the Mirage universe. In the 2012 series when Classic Donatello and 2012 Donatello go back to the Mirage Universe, the Mirage turtles don't recognize Classic Donatello and attack him and 2012 Donatello. At no point do they acknowledge Turtles Forever either.
Even if you argue about the 2012 Crossover taking place BEFORE Turtles Forever, it still makes no sense because the classic Donatello would have already known about the Prime Mirage Universe before hand (and he treats it like he's never been there before) and the Mirage Turtles don't acknowledge that they've seen 1980's Donatello before.
Even if one says that the contradictions are the result of time travel altering the course of history, there's no evidence to support this and it still doesn't line up either way. I also won't use the "Well the Mirage turtles forgot about 1980's Donatello/1980's Donatello forgot about the Mirage Universe" excuse since there's no way they'd forget such unusual (not to mention crucial) events.
All in all I argue that despite the whole multiverse explanation, it creates a large string of overly complicated crossover scaling that should be treated like standard Crossover Scaling. At this point they might as well just be composites if so many incarnations are going to be acknowledged anyway.