Aliens are coming... to get up your nose!
They don't want our oil. They don't want our water. They don't want our Brussels Sprouts. (Actually, neither do we.) They just want our snot!

The gang face their toughest challenge yet, as they go after a terrifying flying alien. Jack's inventing skills will be tested to the limit, one of his friends will fall, and all of his courage will be needed when he takes on the worst ordeal of all. Eating a school dinner...