From Dispensationalism Today, Yesterday, and Tomorrow by Grover Gunn 

In Reformed interpretation, the unifying theme that is the key to understanding the development of redemptive history is the saving work of Jesus Christ. God created Adam and gave him the earth to rule and to subdue. Because of Adam’s fall into sin, the earth was cursed and man became a servant of sin and Satan. God immediately promised a coming Seed of woman who would overcome Satan and reverse the effects of the fall. The rest of redemptive history is the developing story of the restoration of fallen man’s earthly inheritance and authority through the work of the Seed Redeemer on behalf of His people. The theocracy of Old Testament Israel fits into this redemptive drama as a localized pledge and prefiguration of the coming perfect kingdom rule and everlasting earthly inheritance that the Christ will establish for His people and as the national means through which the Christ was brought into the world. Through the historical work of Jesus Christ, Satan was defeated and Jesus of Nazareth, who is fully man as well as fully God, was exalted to the place of all authority in heaven and on earth. In this age, Christ is exercising His authority, the nations are being discipled, and Christ’s universal rule over men is being extended to the uttermost parts of the earth. The drama of redemption will find its ultimate and final fulfillment in the glorified new earth of Revelation 21 after Christ returns.