Zack McGee’s life has been filled with trouble since Amp, a four-inch-tall alien scout, crash-landed into Zack’s bedroom. But now it’s Amp’s turn to be in the hot seat. When his commander, Ohm, arrives to take Amp back home, the aliens feud. It’s up to Amp to get his cranky counterpart off Earth before they all end up in a world of trouble!

Like every book in the Alien in My Pocket series, Ohm vs. Amp mixes Common Core–aligned science and safe, hands-on experiments with hilarious stories young readers will love. And in this fifth book, kids will learn about leverage and how to make their very own rocket-launching atlatl.