On the day of the Panda Planet's centennial celebration, the evil Commander Mouse and his gang seize the opportunity to take over. He controls all the pandas, turning them into clowns, while Space Panda and his friends accidentally escape the disaster and arrive at the mysterious underground world within Panda Planet. In this enigmatic subterranean realm, Space Panda bravely embarks on a quest to find the Panda Clan's greatest secret artifact in order to save his people. However, Commander Mouse has other plans—he aims to steal the hope of the Panda Clan and use the artifact to fulfill his greater ambition of ruling the entire universe. The two sides engage in a series of battles of wits and courage within the magical underground world, but Space Panda remains unaware that danger is already closing in on him. Faced with family bonds and friendship, how will he confront these challenges? Can Space Panda save Panda Planet...