A gigantic fire breaks out on Yakimanka. Dozens of special teams arrive at the scene. But the fire cannot be localized. The asphalt bursts from the heat, streams of people in ancient caftans and hats, with chains and poles in their hands, pour out of the cracks. They rush at firefighters and police officers in a cordon. Will they be able to stop them? Another time capsule is being prepared to be sent to Yakimanka. This time it is filled with carnivorous dinosaurs. Will our heroes - the boy Vanya, his Dad and Mom, an old traveler through time and galaxies, who temporarily took the form of Archie the dog - be able to stop the young scientist? It was he who invented the apparatus for transporting time capsules in our time. A significant day in the life of our heroes was preceded by a trip to Crimea, where in the depths of the famous rocks of Adalara, grandmother Vanya, an experienced scuba diver, found a mysterious box. The old traveler through times and galaxies was in it. The time has come to fulfill the promise he made to Vanya: “I will always come to your aid.”