The Skrugg are a race of highly technologically advanced aliens in the anime/manga series Heroman.
Introduction
A specific ship of the Skrugg intercepts up an interplanetary message originating from Earth, in which Matthew Denton invites his "neighbors and friends" to visit Earth. The commander of the Skrugg immediately decides to invade the planet in order to secure their future resources.
Culture
The original homeworld of the Skrugg is neither seen nor mentioned in the series, but their attitude towards Denton's communication and the fact they are seen leaving a lifeless, collapsed planet behind before traveling to Earth seems to indicate they are a purely nomadic species (at least the group seen).