Wipeout!

The Skins make all the humans in Roswell, New Mexico disappear turning it into a ghost town. Their assault ends with the death of one of the aliens: Courtney the helpful Skin. Fortunately Tess uses her mindblowing powers and destroys all the other Skins or so it seems until Max and Tess spy a boy resembling Nicholas on a scooter at the end of the episode.