Peacekeepers

"Peacekeepers" is the fifth episode of Book Two: Spirits of The Legend of Korra and the seventeenth episode of the overall series. It aired on Nickelodeon on October 4, 2013.

Overview
''When the president of the United Republic refuses to help Korra, she decides to take matters into her own hands. Korra needs to attempt to get military troops to the South Pole with hopes that the President would be none the wiser to defeat Unalaq.''

Trivia

 * After a huge argument, Korra and Mako break off their strong and close romantic relationship, as their own separate jobs are keeping them from being together.
 * This is the closest Korra has ever come to executing her Uncle's pacification ability on a dark spirit. Unfortunately, it had failed to fully calm the spirit.