|This article belongs to Rex's Universe within the Classic Continuity|
The "Nanite Event" spread microscopic machines called nanites across the world, and nanites are present in nearly every living being. When a person, animal, or plant's nanites spontaneously activate, the victim is mutated into a being known as an "Exponentially Variegated Organism," or E.V.O. for short, becoming monstrous and typically losing any sanity and going on a violent rampage.
The EVO threat is controlled by an organization known as Providence. EVOs, Providence, and other places like the Bug Jar are present here and not the universe of Ben. In this universe, alien contact has not been established and the idea of aliens is seen, at least by Rex, as something ridiculous.
There are no counterparts of Ben Tennyson or other related character on Rex's universe.[DR 1] This was proven true during Ben's visit to this universe, as he hypothesized that Gwen, Kevin, and Max may not exist on Rex's Earth. Similarly, no one seemed to recognize him upon his arrival.
- Rex Salazar
- Rebecca Holiday
- Agent Six
- White Knight
- Bobo Haha
- Black Knight
- Caesar Salazar
- Diane Farrah
- Providence Agents
- The Pack
- Generator Rex was originally intended to take place in the same universe as Ben 10, but that did not come to pass due to both series having different toy licenses.[MoA 1]
- Though both shows take place in separate universes with their own histories, the crew is looking for ways to rectify that.[DR 1]