Ben Tennyson in this movie series is a 10 year old boy who gets an Omnitrix (an alien watch style device).
This Omnitrix allows him to transform into different alien creatures with different but special capabilities.
With this special device, Ben 10 (Ben Tennyson) fights evil both on Earth and in space. Follow him in different series of his adventure.
Some recommended series are;
β Ken Ten
β Ben 10 VS Negative Ten (Part 1 & 2)
β Kraken Attack
Ever watch this cartoon series�
One of my favorite cartoons is Ben-10. But due to time it is not seen now. Thanks bro for reminding me of the matter