The Rosary is often considered the second most important prayer in Catholicism - the most important, of course, is the sacrifice of the Mass. What makes it so powerful is its connection with the Blessed Mother, and ultimately, how it brings us closer to Christ through her example.
Indeed, Mary herself has exhorted Catholics to pray the Rosary through apparitions and appearances to Saints. Tradition holds that she appeared to St. Dominic, who lived in the 12th-13th centuries, and told him that the Rosary was a powerful weapon to combat heresies. Hundreds of years later, while WWI raged throughout Europe, Mary appeared to three children in Portugal, asking that Catholics pray the rosary for the intention of peace.
In the episode, Bishop Wall reflects on the importance of the rosary - in troubled times and in peaceful times - and gives advice for forming the habit of praying the rosary daily.