Ben 10: Omnitrix Aliens (Omniverse) / Characters - TV Tropes

Astrodactyl (OV-28) Astrodactyl was sampled from an unknown species (which Word of God states to be a "Pturbosaurian") from the planet Terradino, the same planet that Humungousaur

Ben 10: Supporting Characters / Characters - TV Tropes

Ben 10: Omnitrix and Ultimatrix / Characters - TV Tropes

Ben 10: Omnitrix Aliens (Ultimate Alien) / Characters - TV Tropes

Ben 10: Supporting Characters / Characters - TV Tropes

Ben 10: Omnitrix Aliens (Omniverse) / Characters - TV Tropes

Ben 10: Omnitrix Aliens (Ultimate Alien) / Characters - TV Tropes

Ben 10: Omnitrix Aliens (Original Series) / Characters - TV Tropes

Aliens Cartoon png download - 799*599 - Free Transparent Ben 10 Omniverse png Download. - CleanPNG / KissPNG

Ben 10: Omnitrix Aliens (Reboot) / Characters - TV Tropes

Ben 10: Omnitrix Aliens (Ultimate Alien) / Characters - TV Tropes

Ben 10: Villains (Ultimate Alien) / Characters - TV Tropes

So, out of the 5 Ben 10 Series, which one do you think added the best alliens to the Omnitrix arsenal ? : r/Ben10