Zack McGee's life has been filled with trouble since Amp, a four-inch-tall alien scout, crash-landed into his bedroom. But now it's Amp's turn to be in the hot seat. The Erdians have received a distress signal from Amp's ship and dispatched Ohm, Amp's commander, to collect the stranded alien. But when Ohm arrives, Zack's bedroom quickly becomes the battleground for an alien 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 that young readers will love.