The Lunanimals are a species of reptiles that live in Earth's Moon that are unique to Earth-5391, a reality where the Moon can support life and technology has taken great leaps since the late 20th century. The creatures were utilized by the Saturnians to attack both the Positpeople and Neganatives of the Moon and force them into war. Their plot was uncovered by the Space Sentinels leader Speed Cater and his sidekick Johnny Day when they were shot down on the moon by the Saturnians. They exposed the plot and helped foster peace between the two warring groups. The Lunanimals used in the attacks were then slain by Carter and Day.