The emphasis for the last Sunday before Advent is different in the 1979 BCP. Although Christ the King Sunday is not officially celebrated in the Episcopal Church, the collect for the last Sunday of the liturgical year (Proper 29) in the 1979 BCP prays that all the peoples of the earth may be brought together under the "most gracious rule" of Christ, "the King of kings and Lord of lords" (BCP, p. 236). However, the collect for the third Sunday of Advent begins with the prayer "Stir up your power, O Lord, and with great might come among us. . . ." (BCP, p. 212). See Christ the King Sunday.
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.