X-Dimension
- The X-Dimension is an alternate universe paralleling the Armada cartoon in the Unicron Trilogy continuity family.
The X-Dimension is an alternate universe that parallels the Transformers Armada cartoon series. Virtually nothing is known about it, save that it is home to the X-Dimension Mini-Cons.
Legacy

The X-Dimension has never actually appeared in any fiction. According to the Micron Legend Year Book 2003, it was originally intended to be the subject of a mini-comic that starred the thirty Japanese-exclusive "X-Dimension Mini-Cons" released by Takara, telling the story of this parallel universe from the little bots' perspective. This comic never materialized, although in 2003/4, a 13-part mini-comic "Linkage" was produced as a pack-in for the Japanese Micron Legend (Armada) DVD-release, which retold the Armada conflict from the perspective of the Mini-Cons...but in the mainline cartoon continuity, rather than an alternate universe. It seems probable that the X-Dimension comic was dropped in favor of "Linkage" when Takara realized that the Armada cartoon was borderline incoherent a bit messy in places and needed someone to clean house more than they needed an alternate-universe retelling.
2005's Cybertron franchise introduced Planet X, a world from a parallel universe to that of the Unicron Trilogy. It's not impossible that this parallel world could (conceivably) be the X-Dimension, or at least, given the name, a nod to the concept.
Beginning in 2009, several of the X-Dimension Mini-Con toys were repurposed to represent unrelated characters from the Shattered Glass "mirror universe." This was likely a deliberate homage to the X-Dimension toys representing characters from an alternate universe...but Shattered Glass universe itself is not the X-Dimension.

