1La relève
A new villain comes into town, his name is Darkstar, he commits some crimes and gets the team's attention fast
2Seuls au monde
During a battle Ben and an alien commander are teleported to a distant world. They must put their differences aside if they're going to have any chance of finding a way to return to Earth.
3Le double maléfique
An alien impersonates Ben with hopes of using his Omnitrix to annihilate him.
4Le bal
Kevin asks Gwen to the school dance; Ben fears he's losing control of the Omnitrix.
5Sous couverture
Cooper is kidnapped by the DNAliens, who want him to build a mystery arch.
6Projet animal de compagnie
To find and destroy the alien dragon species, the Forever Knights capture Ship to control a starship they built out of alien technology to locate their homeworld and destroy them.
7La punition
When Ben's parents discover his ability to turn into aliens, they forbid him from using the Omnitrix and later ground him from using it again. Eventually Gwen is grounded too leaving Kevin to stop the DNAliens.
8L'Être et le Néant
After Gwen receives an S.O.S. from Helen, Ben must go into the Null Void to save her and Manny. Once there, he must find The Wrench in order to stop D'Void, who happens to be Ben's old enemy Dr. Animo
9L'infiltré
Ben and the gang rescue a runaway prisoner of the DNAliens.
10Mon semblable
The gang helps the prince of the arachna-chimps regain power
11Les engloutis
Ben cares for a baby monster and helps locate its parents before the DNAliens find it.
12La Guerre des mondes, partie 1
Ben, Gwen and Kevin gather their allies to counter the threat of the incoming Highbreed fleet. Azmuth reveals a secret about the Omnitrix.
13La Guerre des mondes, partie 2
Ben goes to the HighBreeds' world in an attempt to stop their attack on Earth.