Gumball and Darwin Watterson are on quite the adventure with Cara, the fourth incarnation of Neas, the Gladiator of Gallifrey. There's only one problem: none of them seem to remember it. Their memories have been tampered with by a corporation known as "Rekall," and their only lead to putting the pieces back together is a man named Douglas Quaid. Unfortunately, Quaid himself is going through a crisis, unable to discern what's real and what's a lie. Together, they not only have to solve the mystery of their missing memories but also avert the tyrannical regime of a Martian dictator.