When the Rugrats family vacation goes awry, they suddenly find themselves on a deserted island. Hopelessly stuck in the middle of nowhere--without cellphones or cookies!--the Rugrats encounter lizards, leopards and bug-eating plants, not to mention the wildest discovery of all--the Thornberrys! But poor Spike isn't having nearly as much fun. His sniffer is on the blink and his reckless Rugrats are wandering through the rainforest alone. Can Eliza Thornberry, who speaks fluent Dog and all animal languages, help the hapless rugmutt find his diapered gang before Siri the white leopard turns their island adventure into a castaway's nightmare?