Detecting the presence of superior technology equal to or above that of the Omnitrix, Ben, Gwen and Kevin come upon an enigmatic green box that can imitate their appearance, voice and actions almost perfectly. Just as they figure out not to behave aggressively around it, the Vreedle brother come by to take it. In their care, the thing (which the Vreedles call a Naljian Destructor) decides it likes blasting things, giving Ben's team quite a time to bring it under control. Written by
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There are no people around when Ben, Gwen and Kevin enjoy their smoothies and get a visit from the Vreedle brothers, but when the imitation Humungousaur with cannon arms starts firing at buildings, suddenly there are people around to run away in fear. See more
The robot may have took the wrong lesson from our completely reasonable actions.
W-what do you mean "took the wrong lesson?"
He learned that he really LIKES destroyin' things.