The Blythes are loud, loving, and a little bit chaotic – the perfect place for Prez, a silent boy with a lot on his mind, to stay. But everything changes the day a pint-sized alien named Sputnik shows up at the door claiming to be a relative. While the Blythes see a scruffy dog, Prez sees a trouble-making space explorer with a backpack full of bizarre gadgets. As Sputnik ropes Prez into completing a guidebook titled Ten Things Worth Doing on Earth, the pair cause mayhem, dodge disaster, and draw closer to what matters most: finding your voice, and somewhere you truly belong.