Samuel Johnson — always with his faithful dachshund, Boswell, at his side — just wants to show some initiative by getting an early start on Halloween trick-or-treating. He had no way of knowing that he’d be interrupting his neighbors, the Abernathys, as they try to summon Satan himself. And the Abernathys couldn’t know about the malfunction in the Large Hadron Collider — or that their combined forces would open the gates of Hell. Now it’s up to Samuel and Boswell to save the world from evil, with help from some most unusual friends.