Now that Fast Food Freddy has Professor Fizzy in his clutches, can the Lunch Lab kids rescue him from Greasy World?

Oh, no! Henry and Avril have just discovered that Professor Fizzy is missing from the Lunch Lab. And so is the rest of the crew, even the Freezer Burn Band. It can only be the work of their archnemesis, Fast Food Freddy, who is holding his rivals captive at Greasy World, the unhealthiest theme park on the planet. The trouble is, Henry and Avril find that they have to ace a bunch of Greasy World challenges in order to free their friends from Freddy and his Grease-bots. Can everything Henry and Avril know about healthy food help them win carnival games that are rigged in favor of junk food?