The episodes vary between standalone adventures and multi-part specials.

The series kicks off with "The More Things Change," where Ben’s longtime partners Gwen and Kevin depart for college, leaving him to act as a solo hero. However, Grandpa Max soon pairs him with , a by-the-book rookie Plumber from the planet Revonnah. Their partnership becomes the heart of the show as they explore the secret underground alien city of Undertown . Breaking Down the Seasons and Story Arcs

In the final seasons, the series tackles time travel. Ben encounters his future self, , and must team up with various versions of himself across different timelines to stop the timeline-eating entity known as the Chronosapien Time Bomb . This arc brought back the fan-favorite character Professor Paradox and solidified the series' place in the wider Ben 10 multiverse.

For viewers, Omniverse represents the maturity of Ben as a hero: he is no longer just a kid with a watch, but a seasoned protector who understands the responsibility of his power, even if he still cracks jokes while saving the universe.