Some TMNT stuff really isn't for little kids.
In the IDW comics, the name Dimension X is known for the first time in connection with Krangs ancestry as an Utrom. There is a major time difference between it and the earthly dimension, in which the time on Earth passes much faster than in Dimension X.
The following worlds have become known in this continuity:
- Utrominon - The now former homeworld of the Utroms and the former center of their galactic empire
- Neutrino - The homeworld of the Neutrinos which became involved in a bloody war after Krang went looking for Professor Honeycutt
- Morbus - A hostile prison world, which was once subjected by Traxus until Krang killed him, and so was his trial by fire as the heir to the throne of the Utrom Empire.
- Stone Soldiers