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This is the third novel-in-doodles featuring time-traveling, alien-slaying sixth graders Alex, Herbert, and Sammi. The trio hurtles back and forth through time to defeat AeroStar, a 111-year-old villainess using giant carnivorous plants to exact her revenge on present-day Earth. Sometimes confusing time-travel logic is offset by an energetic plot and funny black-and-white sketches.