Space Case : Season 1 Episode 22

The Magnavors attack two aliens who try to communicate with them, thinking they are Earthlings, and when the aliens counterattack, the terrible trio runs scared. Hoping to gather some research on Earthlings, the aliens disguise themselves and go to Hillhurst. When the terrible trio arrives shortly thereafter, the aliens take them and the house monsters hostage. The BeetleBorgs restore peace and the aliens depart, saying that Earthlings are too weird for their study!