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Description:  They rescue Kai's parents from their crashed spaceship on "the 4th moon of Jupiter." (Callisto?) With stopover at the Coliseum in 250 A.D. Rome to get a gladiator's net to subdue a prison ship guard. They use a technique of going back in time every 10 minutes, to create a "fleet" of 8 time machines around the crashed prison ship, to psyche out the guards. In the end, they rescue the guards and the prisoners, and reunite Kai with his parents. He goes back (to the future) to live with them, though planning to visit his pals in 1964 often. Though they make it clear that they can't exit the time machine on the Jupiter's moon surface without spacesuits, they somehow can get the guard and Kai's parents in and out without an airlock. This is the story I distinctly remember when I was a kid, after reading some of the 1970s stories in BOYS' LIFE, I found the book THE TIME MACHINE TO THE RESCUE at my public library.