Follows two brothers, ages 8 and 12, Álvaro and Paloma, fascinated by the ingenuity of an old inventor who has built a machine on whose screen he can see past times. But the restless Álvaro, messing around, gets into the big plasma screen. His sister follows him and the old inventor has no choice but to go after them. They will start a fabulous journey that will take them from Prehistory to the Middle Ages, finding themselves in their busy adventure with the most incredible characters and the most unexpected surprises.