Ben Tennyson

Benjamin Kirby "Ben" Tennyson, better known as Ben 10, is the titular protagonist of the Ben 10 franchise and a fictional superhero created by Man of Action for Cartoon Network. In the original series, Ben began the franchise as a 10-year-old boy on a summer vacation with his family and accidentally discovers the Omnitrix, a watch-like device of alien origin that allows the user to transform into various alien species. Originally, the Omnitrix was limited to 10 aliens, but more were unlocked through various methods. Supported by his cousin Gwen and grandfather Max, Ben fights common criminals like burglars and robbers but is quickly drawn into fighting more advanced foes such as Vilgax, Dr. Animo, Kevin 11, The Forever Knights, and more. At some point after the original series, Ben retires and removes the Omnitrix for unspecified reasons. Ben resumes a normal life for 4 years until forced out of retirement after his grandfather's disappearance while investigating the alien race known as the Highbreed in the sequel.

In Alien Force, Ben investigates Max's disappearance with the help of his cousin Gwen and Kevin (formally Kevin 11), who reforms and joins Ben's team. The trio learns of the existence of the Highbreed and their henchmen, DNAliens. They continue investigating the Highbreed and form alliances with many individuals. The Highbreed attempt to invade Earth but are stopped by the combined forces of Ben, Gwen, Kevin, Max (who is revealed to be alive), and the rest of his allies. Ben is greatly awarded for his heroic deeds from hundreds of planets across the galaxy, but his judgment becomes clouded and many enemies from his past return to face him. Vilgax teams up with Albedo (an alien who looks like Ben armed with an Omnitrix which can evolve aliens) and attack Ben and his allies. Ben succeeds in defeating the two, but the Omnitrix is destroyed, and Ben replaces with Albedo's Omnitrix which is dubbed the Ultimatrix.

In Ultimate Alien, Ben's wielded the Ultimatrix for roughly a year and his secret identity has been revealed worldwide and tries his best to adapt to it. Over the course of the series, he deals with the arrival of the Andromeda Aliens and the threat of Ultimate Aggregor and helps stop the combined threat of Diagon and the Esoterica and is awarded a brand new, completed, Omnitrix.

In Omniverse, Gwen and Kevin leave for college and Ben gains a new partner, Rook Blonko. He deals with stopping the faction composed of Malware, Khyber, and Dr. Psychobos, defending Earth from the invading Incurseans, battles alternative versions of himself, and deals with the Time War in which he's victorious against Maltruant.

In the 2016 series, the character underwent a reboot, returning to being a 10-year-old boy who travels across the country during his summer vacation, along with his grandfather Max and cousin Gwen, and uses his powers to fight supervillains. Ultimately, Ben meets his adult future self, helps the young Generator Rex, and fights alongside alternate versions of himself to defeat Alien X, later revealed to be a villainous version of himself as an adult.