Phantom Lake County is known for its share of strange occurances, from monster attacks to alien invasions. However, things will never be the same when, after experiencing inexplicable earthquakes emanating from a local system of caves, the area is overrun by grossly mutated creatures of unusual size, a phenomenon that may point to the return of a long-since-forgotten menace! Thankfully, the Phantom Lake Kids are "on the job" and determined to solve the real mystery: What's the deal with Butch's magic hat?

Steve has gone missing but Stu, his loyal sidekick (and nephew), knows exactly how to find him: get human help! He sets out to find Steve's old friend, Danny Johnson, and discovers the next best thing: Danny's sister Evelyn (Alice Mihm)! With Evelyn's help, Stu embarks on a wild adventure that takes him from outer space to the North Pole and several exotic points in between. Along the way, he battles an old nemesis, meets one of Earth's most legendary holiday characters, and celebrates the joys of the holiday season!

Stuck in their house during a government-mandated worldwide quarantine, the Phantom Lake Kids (Danny Johnson, his sisters Alice and Evelyn, and their wacky friends Butch, Chip, and Billy Blue) are shocked when most of the gang inexplicably disappears in a flash of light-then reappears moments later. When Alice doesn't return, the rest must meticulously (and hilariously) unravel the mystery behind her disappearance and the invisible forces behind it. Could it be...aliens?