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Gumball has his sights on one thing: getting the new action figure of action superstar Knife Fightgood... except when the package gets delivered, he sleeps through it. When Gumball and Darwin confirm the delivery has been made, they know the worst has happened: someone's stolen Gumball's toy! Along with Anais, the boys set off through town following the clues to a mysterious underground system Beneath Elmore and uncover a truth they never thought possible. From writer Megan Brennan (Steven Universe, Pencil Pup) and artist Kate Sherron (Regular Show) comes Elmore's greatest detective caper yet!