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Bear Er, who is a bit lazy and has a sweet tooth, always makes mistakes and commits errors, but deep down, he dreams of becoming a hero to gain recognition, especially from his older brother, Bear Da. The fall of an alien nucleus disrupts the peace of Dog Bear Ridge, and Bear Er unexpectedly fuses with the alien nucleus, transforming into a bear with alien wisdom and energy. However, this is followed by the "alien" Abu's attempt to seize the nucleus. To retrieve the nucleus, Abu deliberately creates trouble, causing Bear Er to become estranged from everyone. Just as Abu is about to succeed, an attack by a mysterious high-tech army completely disrupts his plan, plunging the Bear Strong trio and even the entire Earth into immense peril. What is Abu's true identity and purpose for coming to Earth? What is the story behind the mysterious high-tech army? Can the self-abandoned Bear Er rise up to fulfill his dream of becoming a hero? Can they save the Earth from its crisis?