Few things are as iconic in the Scooby-Doo spookiverse as the one-of-a-kind Mystery Machine. For decades, the 70s-era mobile mystery lab has traveled from town to creepy town in search of the truth behind armored ghosts, weird witch doctors and glow-in-the-dark deep sea divers. But what happens when it breaks down? When the engine dies, it's time to say "Ruh-roh!"