The four Star Ka'at stories together in one book Star Ka'atStar Ka'at WorldStar Ka'ats and the Plant PeopleStar Ka'ats and the Winged Warriors Intelligent, talking Ka'ats come to Earth on a strange mission. In ancient days, Ka'ats had visited Earth and some had stayed to live in peace with humans. Then the humans cruelly turned against their friends. Now Ka'ats from outer space have come back to try to rescue their cat kin. Although the Ka'ats believe that humans are inferior, warlike beings, they form a deep attachment to two young orphans, Jim and Elly Mae. Their relationship plunges Jim and Elly Mae into adventures living on the Ka'at planet and helping Ka'ats and other aliens.