Ben Tennyson (Classic)/Omniverse

After the events of Ultimate Alien, Ben is left to be a sole hero after Gwen and Kevin leave for college. However, Grandpa Max has other plans. He teams Ben up with a Plumber Rookie just out of training, Rook Blonko. Ben does not want to have a partner and tries refusing Rook, but in vain. Setting their differences aside, the two soon learn to work as a team and look out for each other.

The More Things Change: Part 1
11 years old Ben: Ben as Four Arms fought Malware. While at first it appeared that Ben was winning, Malware managed to grab the Omnitrix and forced Ben to transforms back to human.

Malware confronted Ben and taunted him about his defeat, which allowed just enough time for the Omnitrix to activate again. Ben transformed into Feedback and used his energy absorbing and redirecting powers to quickly defeat Malware.

A Jolt From The Past
11 year old Ben: Ben as Stinkfly fought a Megawhatt.After reverting he grabs a Mr. Smoothy cup and traps the Megawhatt in it.

Thinking that he has won,the Megawhatt escapes the cup and duplicates.Ben remembers he has Feedback and turns into him and sucks the energy out of the Megawhatts and go to sleep.

Of Predators And Prey: Part 1
Khyber Takes some time to hunt Ben down after Rook and him split there team up

Outbreak
Strange things begin to happen when Dr. Psychobos steals a peace from the omntrix

Rook gets turned into an half gourmand, Liam into a half Vexasaurian, Bubble Helmet into a half Gimlinopithecus, and Psyson into a half Pyronite.

To Make Things worst Ben is stuck in one of 3 new aliens.

It's up to Ben, Rook, and a small group of plumbers to get thing back to normal.