Meanwhile on the pirate ship, Shizuka encounters Flock's sister Sarah, who looks exactly like Shizuka. Sarah agrees to help Shizuka. Flock and Sarah reveal that Captain Silver is actually their father, who went mad when their mother died and has become obsessed with gathering as much treasure as possible. Nobita and his friends attempt a rescue operation, but end up rescuing picking up Sarah instead of Shizuka, who is taken directly to Captain Silver. Captain Silver moves on the final stage of his plan. Having seen humanity's destruction in the future, Captain Silver is determined to launch his pirate ship into space and colonize a new planet with all of the treasure he has acquired. However, this requires him to drain the Earth's energy to get the power he needs to reach space.