Five years after the original series, 15-year old Ben Tennyson has returned to a normal, everyday life. His adventures all done, Ben has taken off the Omnitrix and has grown from a young boy into a confident teenager; however, the mysterious disappearance of Grandpa Max makes Ben 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 Omnitrix in the process. At the end, Ben is now armed with a new Omnitrix called the Ultimatrix.
- Ben 10: Alien Force (Video Game)
- Ben 10 Alien Force: Vilgax Attacks
- Ben 10 Alien Force: The Rise of Hex
The opening showed Ben's ten main aliens in Alien Force.
- It was called Ben 10: Hero Generation during pre-production stage.
- The original Alien Force logo had the original series' Ben 10 logo rather than the current one.
- Only the silhouette of Alien X was seen in the opening at the first season, while his full image was later seen at the start of season two and onward.
- On iTunes and PlayStation Network, Season 3 was cut to make Season 4 (Primus is the first episode of season four), but it only applies to iTunes and PlayStation Network.
- On iTunes, the icons of each seasons have the following aliens: Season 1 - Chromastone, Swampfire, and Echo Echo, Season 2 - Spidermonkey , Season 3 - Humungousaur, and Season 4 - Big Chill.
- A comic was based off the series was made, named The Dark of Knight.
- The Theme Song is adapted from the Ben 10: Secret of the Omnitrix intro.