Battle Ben10 vs Aliens Force

Five years after the original series, 15-year old Ben Tennyson has returned to a normal, everyday life.
His adventures all done, He has taken off the Omnitrix and has grown from a young boy into a confident teenager;
however, the mysterious disappearance of Grandpa Max makes Ben10 put the Omnitrix back on, as well as forcing him, his cousin Gwen, and his old enemy Kevin to search and locate Grandpa Max.
At the same time, they must enlist the help of the Plumbers' kids (children or grandchildren of retired Plumbers which are commonly half human and half alien) and repel attacks from a new enemy, the Highbreed.
In the third and final season, Vilgax returns as the main antagonist, forcing Ben, Gwen and Kevin to tackle bigger problems and find out more secrets about the Omnitrix.
In the series finale, The Final Battle, Ben faces Vilgax again in their final battle, destroying the Aliens Force in the process.
At the end, Ben10 is now armed with a new Omnitrix called the Ultimatrix.

When the Omnitrix was recalibrated it gained a more watch-like shape, a green wristband, and became smaller and sleeker with the face plate becoming black and green.
The inside of the hourglass shape on the face now glows in different colors at special moments; these colors signify the state that the Omnitrix is in.
The display mode of alien-shaped black silhouettes printed on the face has been replaced by a dark green 3D hologram hovering above the watch,
giving a more detailed look of the selected alien.

The new Omnitrix also functions as a Plumber's badge which is used in the series as a communicator, a detector of other Plumber's badges,
an alien-language translator, and as a key for accessing the Extranet, an intergalactic Internet.

In Ben10, the reason Azmuth invented the Omnitrix was for all the beings of the universe to better understand each other.
It was revealed in Battle Ben10 vs Aliens Force that there was another reason for the creation of the Omnitrix.
Azmuth tells Ben that the Omnitrix was invented to preserve the DNA of all living beings in the Milky Way Galaxy and restore them if they should ever become extinct.