Is Donatello in trouble with Dimension-X?
 

Krang was banished from Dimension-X. Donatello sent him back there. Did Donatello make everyone's life in Dimension-X more difficult? Did Donatello commit a war crime against Dimension-X?

When are you talking about? Donatello sent him back there? You mean because he reversed the flow of the transdimentional portal in the fifth episode of the show?

Nah... Krang only said he wanted to conquer Dimension X at the end of the first season because it was unknown at the time that the mini-series would take off like it did. His intentions were drawn to Earth in Season 2 and beyond; aside from at "Adventures In Turtlesitting" and "Shredder Triumphant".

Hm. Those in Dimension X might have something to say about that, but it shouldn't be Earth's job to put up with him instead, so feel that Donnie kinda has the right to "return to sender" on that one.