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?

Ran is back and up to no good as she continues her never-ending quest to get back at Lum! But will she change her tune when handsome Rei shows up? Later, the ultimate cuddly kitty spirit appears, burdened with a heavy grudge in its heart! Can Ataru and gang help this cat or will they just make everything worse?