| Synopsis | - The Marvels use Dexter Knox's device to see into 1960, where Earth has colonized the Solar System, and see the Sivana Family attacking spaceships from Earth. They travel there using the Rock of Eternity. The Sivanas have time-travelled to 1960 and with their Plutonian allies hope to invade the Solar System. The Marvel Family fights the Sivanas, who use smoke clouds to escape them. Their allies ships use the same methods. Dexter Knox sees the problem and uses a time-pill to travel there. He says they should make a Planet Prep, training an army to defeat the Sivanas ships. The Sivanas push a meteorite towards the Academy, but the Marvels stop it. The Sivanas parachute in and disguise themselves to sabotage the Academy. The Marvels stop the sabotage attempts. However they find Sivana is holding Dexter hostage with a knife at his throat, and he tells the Marvels to turn back. When they do they are coshed by Jr. and Georgia. All four kids are bound and gagged and taken to a ship being used for target practice. The ship is towed into the air while the Sivanas watch. However Billy jumps out in time followed by the others. He then uses his foot to remove Freddy's gag, he becomes Captain Marvel Jr., frees the others who transform, and they save Dexter. The trained fleet sets off, though Dexter isn't allowed being too young. They defeat the Sivana Fleet after a rousing talk from Dexter, and Mary Marvel stops the Sivanas escaping by time travel on Pluto. The Marvels take the Sivanas back to 1952.
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