13 episodes · first aired 2008-10-10
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | Darkstar Rising 2008-10-10 | A new villain comes into town, his name is Darkstar, he commits some crimes and gets the team's attention fast | 2008-10-10 | 9.0 |
 |
Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.
| 02 |
Alone Together 2008-10-17 |
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. |
| 2008-10-17 |
| 9.8 |
 | 03 | Good Copy, Bad Copy 2008-10-24 | An alien impersonates Ben with hopes of using his Omnitrix to annihilate him. | 2008-10-24 | 8.6 |
 | 04 | Save The Last Dance 2008-11-07 | Kevin asks Gwen to the school dance; Ben fears he's losing control of the Omnitrix. | 2008-11-07 | 9.0 |
 | 05 | Undercover 2008-11-14 | Cooper is kidnapped by the DNAliens, who want him to build a mystery arch. | 2008-11-14 | 8.2 |
 | 06 | Pet Project 2008-11-21 | 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. | 2008-11-21 | 8.8 |
 | 07 | Grounded 2008-11-23 | 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. | 2008-11-23 | 7.0 |
 | 08 | Voided 2008-12-05 | 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 | 2008-12-05 | 8.2 |
 | 09 | Inside Man 2008-12-12 | Ben and the gang rescue a runaway prisoner of the DNAliens. | 2008-12-12 | 8.5 |
 | 10 | Birds of a Feather 2009-03-24 | The gang helps the prince of the arachna-chimps regain power | 2009-03-24 | 8.2 |
 | 11 | Unearthed 2009-03-25 | Ben cares for a baby monster and helps locate its parents before the DNAliens find it. | 2009-03-25 | 8.5 |
 | 12 | War of the Worlds (1) 2009-03-27 | Ben, Gwen and Kevin gather their allies to counter the threat of the incoming Highbreed fleet. Azmuth reveals a secret about the Omnitrix. | 2009-03-27 | 9.5 |
 | 13 | War of the Worlds (2) 2009-03-27 | Ben goes to the HighBreeds' world in an attempt to stop their attack on Earth. | 2009-03-27 | 9.0 |
