No, this isn't something novelists and filmmakers dreamed up; the second coming of Christ is at the very heart of the Bible's teaching.
In fact, Jesus Himself repeatedly taught that someday He would come again—and when He does, He will subdue all evil and set up His kingdom of perfect justice and righteousness. He promised that "At that time men will see the Son of Man coming in clouds with great power and glory" (Mark 13:26). He also urged us not to be caught off guard but to be ready for His coming, "because the Son of Man will come at an hour when you do not expect him" (Luke 12:40).
How can we be ready for His coming? First, by being sure we have committed our lives to Christ, and are trusting Him alone for our salvation. The greatest tragedy that can ever happen to any person is for them to be unprepared to meet Christ, either at death or when He comes again. Have you given your life to Him? If not, don't let another minute go by without turning to Christ.
Second, we can be ready for His coming by living for Him every day. Someday your life will be over—but what will you have done that is of eternal value? Ask God to use you to point others to Christ, and ask Him to help you live for Him and serve Him every day of your life.