Our friend Roman Sacristan has a good post on how to obtain a plenary indulgence today, the Solemnity of Christ the King, the Last Sunday of Ordinary Time. You should check his blog, often.

Requirements for Obtaining a Plenary Indulgence on Christ the King

– Public recitation of the prayer “Most Sweet Jesus, Redeemer – Act of Dedication of the Human Race to Jesus Christ King” (listed below)

– Say one “Our Father” and one “Hail Mary” for the intentions of the Pope

– Make a Sacramental Confession within a week of (before or after) the Feast of Christ the King

– Worthily receive Holy Communion (ideally on the Feast of Christ the King)

– that one be free from all attachment to sin, even venial sin.

Father Tim Finigan at the Hermaneutic of Continuity blog has a good entry on that last point:

Plenary indulgences not impossible

Most Sweet Jesus, Redeemer – Act of Dedication of the Human Race to Jesus Christ the King

Most Sweet Jesus, Redeemer of the human race, look down upon us humbly prostrate before You. We are Yours, and Yours we wish to be; but to be more surely united with You, behold each one of us freely consecrates himself today to Your Most Sacred Heart. Many indeed have never known You; many, too, despising Your precepts, have rejected You. Have mercy on them all, most merciful Jesus, and draw them to Your Sacred Heart.

Be King, O Lord, not only of the faithful who have never forsaken You, but also of the prodigal children who have abandoned You; grant that they may quickly return to their Father’s house, lest they die of wretchedness and hunger.

Be King of those who are deceived by erroneous opinions, or whom discord keeps aloof, and call them back to the harbor of Truth and the unity of Faith, so that soon there may be but one flock and one Shepherd.

Grant, O Lord, to Your Church assurance of freedom and immunity from harm; give tranquility of order to all nations; make the earth resound from pole to pole with one cry: Praise to the Divine Heart that wrought our salvation; to It be glory and honor forever. Amen.

The “Technical” Stuff

“1. An indulgence is the remission in the eyes of God of the temporal punishment due to sins whose culpable element has already been taken away. The Christian faithful who are rightly disposed and observe the definite, prescribed conditions gain this remission through the effective assistance of the Church, which, as the minister of redemption, authoritatively distributes and applies the treasury of the expiatory works of Christ and the Saints.”

– Handbook of Indulgences, Norms

"20. 1. To be capable of gaining indulgences a person must be baptized, not excommunicated, and in the state of grace at least at the time the prescribed works are completed.

2. Actually to gain indulgences the person must have at least the general intention of doing so and must perform the acts enjoined at the time stipulated and in the manner required according to the tenor of the grant."

– Handbook of Indulgences, Norms

“23. 1. Besides the exclusion of all attachment to sin, even venial sin, the requirements for gaining a Plenary Indulgence are the performance of the indulgenced work and fulfillment of three conditions: Sacramental Confession, Eucharistic Communion, and prayer for the Pope’s intentions.

2. Several Plenary Indulgences may be gained on the basis of a single Sacramental Confession; only one may be gained, however, on the basis of a single Eucharistic Communion and prayer for the Pope’s intentions.

3. The three conditions may be carried out several days preceding or following performance of the prescribed work. But it is more fitting that the Communion and the prayer for the Pope’s intentions take place on the day the work is performed.

4. If a person is not fully disposed or if the prescribed work and the three mentioned conditions are not fulfilled, the Indulgence will only be partial …”

5. The condition requiring prayer for the Pope’s intentions is satisfied by reciting once the Our Father and Hail Mary for his intentions (Pater Noster and Ave Maria); nevertheless all the faithful have the option of reciting any other prayer suited to their own piety and devotion.”

– Handbook of Indulgences, Norms

Grants:

#27. A plenary indulgence is granted to the faithful, who piously recite the above Act of Dedication of the Human Race to Jesus Christ the King, if it is recited publicly on the feast of our Lord Jesus Christ the King, and piously carry out the precepts in Norm #23 listed above.

– Handbook of Indulgences, Grants