BEN 10 ALIEN FORCE

The Plot:

Five years after the events of the original series, 15-year old Ben Tennyson has returned to a normal, everyday life. His adventures done, Ben has taken off the Omnitrix and has grown from a young boy into a confident teenager.

However, a new menace is fast approaching Earth. A race of fanatic aliens, the Highbreed, has secretly arrived on Earth with the intention of destroying humanity. Max, Ben's grandfather and a member of the planet-defending Plumbers, has already set out to try and stop them, but has not been heard from since. Ben has no choice but to once again use the Omnitrix in order to fight back. The Omnitrix has recalibrated to Ben's teenage body, resulting in a new form, functions, and aliens to transform into.

Ben isn't alone, either. His cousin Gwen is once again tagging along, and her natural abilities have significantly grown over the years. Also joining Ben is his former rival Kevin Levin, who has served his time in the Null Void and is trying to reform (though he still partakes in less-than-legal activities). Over the course of the series, Ben, Gwen, and Kevin fight off the Hybrid, do battle with both old and new enemies, and even makes new friends with child Plumbers, some of which bear DNA and alien hero forms identical to Ben's old Omnitrix alien.

Characters:

Ben Tennyson

Ben fills the role of leader after Max disappears. The Omnitrix has been recalibrated, giving him access to a new set of alien heroes. Over the past few years, Ben has matured dramatically.

Gwen Tennyson

Now 15, Gwen is much more proficient with her powers, able to manipulate energy directly as opposed to using spells (this is revealed to be due to Gwen having an alien heritage),where she can manipulate energy to create blasts, shields, and energy like grapple holds. Although she's not nearly as fiery or short-tempered as before, Gwen is still always looking out for her cousin. She also is presumed to have feelings for Kevin Levin (below).

Kevin Ethan Levin

A former nemesis of Ben, Kevin is now getting by as an alien tech dealer. He unintentionally gets involved in the Highbreed plot, and joins Ben out of a desire to make up for his actions. His abilities now allow him to absorb the properties of any solid matter he touches. He has feelings for Gwen, but is somewhat shy about it. And over the course of time, the pair have started dating.

Max Tennyson

Max is a semi-retired member of the Plumbers. He disappears while investigating the Highbreed plot, leaving only a few cryptic messages for Ben to find. He is briefly reunited with his grandchildren in "Max Out", but sacrifices himself to destroy a Highbreed factory at the end of the episode. In the episode "Voided", Ben and Max reunite in the Null Void, and he promises Ben that he'll come back soon. He eventually returns in the second season finale of the show, "War of the Worlds" to aid Ben in his final assault against the Highbreed

Julie Yamamoto

Julie is Ben's current love interest. She enjoys tennis, eating chili fries, and caring for her pet, Ship (an alien Mechomorph found by her and Ben).

Highbreed

The Highbreed believe themselves to be the purest of all species, and intend to cleanse the galaxy of impure lower life forms. Earth is their current target. It's later revealed that they are dying out, having lost their resistance to disease due to heavy inbreeding, and that they intend to destroy the rest of the universe with them.

DNAliens

Hybrids of humans and alien drones that serve the Highbreed, the DNAliens are able to disguise themselves as humans using special identity masks.

The Forever Knights

A secret organization that has worked in secret ever since their formation in the Middle Ages. The Forever Knights will trade alien technology with anyone who's willing, even the Highbreed

sources from wikipedia