"Science fiction Juvenile fiction." . . "Time travel Fiction." . . "Time travel (Future) Fiction." . . . . "Young adult works"@en . . . . . "Young adult fiction"@en . . . "Preparing to thwart the evil Kurtz at any cost, fearless Ned Banks is stopped in his tracks when Kurtz kidnaps Ned's best friend, Roop Johnson, and threatens to have him space-erased."@en . . . "Fiction"@en . . "Juvenile works"@en . . "Kurtz is back and meaner than ever, but Ned Banks isn't scared. He's determined to save his missing friend, Roop."@en . . . . "Zero hour"@en . . . . . "Time travel Juvenile fiction." . . "Science fiction." . .