The Tech 10 universe originally began on July 12, 2010, with the series Tech 10: Ultimatrix Unleashed. Standing out from other series on the wiki with its unique first-person narrative, this series became somewhat well-liked and even inspired other series in similar styles. The series would ultimately end on December 23 of the same year, with a total of 28 entries.
Tech 10: Ultimatrix Unleashed is a series about Tech, an eleven year old Human that finds the Ultimatrix after Ben discontinues its use. It is written in a log-style format, with each 'episode' taking the appearance of a journal entry.
Colossal Christmas Crossover
The Colossal Christmas Crossover was a crossover between multiple series that took place around...well, Christmas! Ultimatrix Unleashed was one of the series included, and while the special actually took place before Ultimatrix Unleashed ended, its events canonically happened between Ultimatrix Unleashed and Combalien Evolution. Despite this, its events are technically counted as part of Ultimatrix Unleashed.