Board Thread:General Discussion/@comment-2133523-20140131173125/@comment-241978-20140502060256

Technically, Eon is actually two different but related characters. There's a theory floating around to explain how they're connected and why they're treated as the same character in the series.

The original Eon was a Chronian who appeared in Race Against Time. After his plot failed, he presumably attempted to repeat the process in another timeline and succeeded. However, he suceeded too well, and the Eonized Ben lost the ability to distinguish the difference between his Ben and Eon personalities and went homicidally insane. He killed the original Eon and assumed his identity. The second Eon then went on a mind-control/murder spree in an attempt to become the only Ben in cross-time.