Rocket to the Moon #1 (1951)

Rocket explorer Ted Dustin and Princess Maza of the lunar world must battle against green monsters and hostile forces threatening both the Moon and Earth. After Ted's ship is damaged in combat on the Moon, he returns to find that an interplanetary war is being planned, with an attack scheduled for five days hence at the Imperial Palace on Pelion. The story continues with Ted and his companions on Earth in Slavonia, where they encounter Dr. Valdez and become embroiled in further conflict while attempting to prevent the impending alien invasion.