Complete story — includes the ending
An Arachnichimp (Spidermonkey's race), Simian, needs help in retrieving a crystal which is supposedly the symbol of the monarchy on his planet. Ben offers his help, but Kevin and Gwen are skeptical. In the midst of the battle, Ben discovers that Simian has been lying, and that the crystal is actually powering an intergalactic communications station. By stealing it, Simian will prevent Earth from calling for help against the Highbreed invasion.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Ben 10: Alien Force episodes. HTML formatting and reference markers removed. · Content license