Watch Ben 10: Alien Force Online
Ben 10: Alien Force is the sequel to the Ben 10. The series takes place five years later after the original. Ben no longer wears the Omnitrix, and his cousin, Gwen, has honed her skills in magic. But when an alien invasion of the DNAliens strike Earth and Grandpa Max goes missing, Ben decides that it's hero time once again. He's not alone, as he is joined by Gwen, and even his old archenemy, Kevin Levin. Now it's time once again for Ben to begin his quest to find his grandfather and stop the invasion from the evil DNAliens. Our heroes will cruise around with Kevin and his car. The show tackles some mature issues, although the target audience is the same.
Ben hands Vilgax the Omnitrix. He soon walks into the forest to find a way for Azmuth to come help. Azmuth reveals some secrets to the Ultimatrix and how to defeat Vilgax and Albedo. Powerless, Ben goes aboard Vilgax's ship and faces off with Vilgax to stop his invasion of Earth. Ben sets the Omnitrix on "self-destruct". Albedo gives Ben the Ultimatrix and Ben shuts off "self-destruct" on the Omntirix. With the Omntirix destroyed, Kevin turns back to his old self. Ben goes off and fights Vilgax with Swampfire but since Swampfire is too weak he soon becomes Ultimate Swampfire and destroys Vilgax.
Albedo has stolen the Ultimatrix from Azmuth and tries to go a Galvan again, once Vilgax arrives they work on an alliance to kill Ben and his Omnitrix. Gwen, Kevin, and Ship are off to save Ben from an old enemy Krabb. They once rescue him and return to Earth. Albedo kidnaps Gwen and Kevin, Ben goes to face Albedo and rescue his friends when he quickly discovers that Albedo has been working in conjunction with Vilgax. Ben is defeated by the pair and gives up the Omnitrix to save himself and his friends.
Kevin returns home to find his house ransacked, so he enlists Ben and Gwen's help to find out who did it and why. They soon cross paths with Ragnarok, a deadly criminal who recently broke free from the Null Void and is in search of a special key. Kevin is intent on stopping Ragnarok from obtaining the special key, especially after he learns the truth about Ragnarok and his father.
The Plumber's Helpers are called upon by Grandpa Max to rescue him from an abandoned space station where he is being attacked by Ben.
An ill Ben is pleased to see an old friend in Tetrax but is caught off guard when Tetrax demands Ben give him Chromastone. Ben doesn't even have a chance to explain what happened to Chromastone when Tetrax attacks him demanding that he be handed over. Ben's situation gets worse when Vilgax shows up and it is learned he is after the same thing. Ben now battles to save himself and to discover why Chromastone is of so much importance.