Ben Tennyson

"It's Hero Time!"

- Ben's catchphrase.

Benjamin Kirby "Ben" Tennyson is a Human, cousin of Gwen Tennyson, and the grandson of veteran Plumber Max Tennyson and the Anodite Verdona.

Appearance
Ben's physical appearance has changed throughout the series from a 10 year old to a 16 year old. However, he retains some recurring characteristics. He has brown hair, green eyes, pale skin, and is quite skinny for his age, though he shows a lot of muscle definition due to being athletic.

History
At the age of 10, he came in possession of the Omnitrix, a watch-like alien device containing genetic material from numerous different species, which allows him to temporarily transform into a number of alien forms. During this time he battled foes such as an Osmosian named Kevin Levin and the Chimera Sui Generis known as Vilgax.

About a year later, Ben became obsessed with a Conductoid named Feedback, though the form was destroyed by a mutant Galvanic Mechamorph named Malware. Sometime later, he took off the Omnitrix for an unknown reason.

Less than four years, Ben put back on the Omnitrix, which recalibrated and assumed a new form. However, he was forced to destroy the Omnitrix to prevent Vilgax from weaponizing it and obtained the Ultimatrix, an Omnitrix-type device with the ability to evolve his aliens into more powerful forms.

By age 16, Ben became world-famous and was given a second Omnitrix after Azmuth deemed him worthy of it; the one he had used prior was revealed to be a prototype.

Canon Aliens
These are Omnitrix transformations that have appeared on-screen through the course of the franchise, or at least have been confirmed to exist by crew members.

Alternate Timeline Aliens
These are Omnitrix transformations that exclusive to specific alternate timelines.

Non-Canon/Alternate Timeline Aliens
These are Omnitrix transformations that are not canon to either the original or reboot continuities, mostly "joke" aliens created by crew members.