Toa Teridax is a version of Teridax who hails from an alternate dimension simply codenamed the 'Kaizer Universe' by the Guardians of Light. The version of Teridax from this universe was captured and put into an artificial Toa body, what little sanity this Teridax had left formed a unique personality, who became the Toa's secret weapon to winning an eternal war with an enemy who would later be discovered to be this universe's version of Takanuva. The original mind of Teridax became sealed within the subconsciousness of this new Toa, who took on the name of Teridax and vowed to make it a name that would be celebrated by the Matoran, rather than hated and feared by them. At some point, the "Great Split" occured in the Kaizer Universe and Toa Teridax was transported to this universe.