The moon Princess and the Thundercat

It happens on third earth when the moon princess (sailor moon) crash lands on the planet and the thundercats come to her rescue. When she comes to she tells them that she and her protectors the sailor scouts come to third earth because her home on third earth's moon is no more. Along with the Dark hearted prince diamond working hand in hand with the monstrous Mumm-Ra, Sailor Moon has to work with the Thundercats to find the lost sailor scouts. And it is later revealed that Lion-O and Sailor Moon are not quite strangers.