Finn and the Subatomic Slip-And-Slide by Michael Buckley

After his adventures through time, Finn returns home to a world he doesn’t recognize. Changing the past has created an all-new present, one in which he and his friends never vanquished the Plague. Now the giant bugs rule Earth from their spaceship! What’s an intergalactic traveler to do? The answer is obvious. Finn, Lincoln and Julep must defeat the Plague. Again. But how? Julep and Lincoln don’t remember Finn or their friendships. In fact, they’ve changed just as much as the world itself has, and they want nothing to do with his dangerous plan to save humankind … Read more.