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Following the mysterious map leads the trio to a desolate area, where they uncover a buried capsule. Initially dismissive of their find, believing it to be junk, their curiosity peaks when they discover that the capsule contains a robot named Echo. The creature has crash-landed from outer space and needs the teenagers' help to repair its ship and return home.
The revelation that Echo can only respond to yes-or-no questions by beeping adds an imaginative twist, fostering a unique bond as they communicate. As the boys learn about Echo's dire situation, a clear mission unfolds: they must gather the necessary parts to help their newfound friend escape back to his home planet.