Beautiful space alien princess Lum invades Earth on her UFO, and unlucky Ataru Moroboshi's world gets turned upside down! Will Lum become Earth's electrifying new leader? Or will Ataru somehow miraculously save Earth from space alien onslaught?

Despite all kinds of crazy supernatural beings appearing and attacking Ataru, nothing brings calamity quite like the kind that Ataru brings on himself... Although, when a rival named Shutaro Mendo appears, the chaos does step up a notch! All disaster and no play makes things dull, however, so Ataru goes on a date with Lum!