Finn Caspian and Explorer Troop 301 get trapped inside the belly of a planet-sized alien in the fourth book of this heavily-illustrated chapter book series about four best friends and a robot growing up on a space station - based on the award-winning kid's podcast with more than 70,000 listeners per episode! Author - Messinger, Jonathan Illustrator - Bitskoff, Aleksei Number of Pages - 128 Format - Paperback Publisher - HarperCollins Published - 2021-08-24