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?

Lum tries to encourage a Tomobiki High student to stand up for herself against some bullies and ends up facing off in the ring against the head of the Butsumetsu High delinquents. Good thing Lum has hidden strength to draw upon! Later, Mendo is called upon to save a fair maiden--by going on a date with her! But the peril Asuka faces is her own boy-phobia, so Mendo just keeps making things worse!