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Two teams touch down at the STARS space station to take on three scientific challenges to win out-of-this world prizes. First, the teams must guess which animals Sam and Ayo are looking at through their telescope, based on a series of clues. Then, in a game based on light and shadows, the young scientists have to figure out what their team captains are holding by observing their shadows behind a huge screen. Finally, the teams must take items from a giant conveyer belt and sort them so that they can be reused and recycled. To make it even trickier, the players are attached to bungee cords!

In the lab, Sam sits in a bathtub, hoping he can come up with a eureka moment of discovery – just like his hero, ancient Greek scientist Archimedes.