Lani, an old friend of Adora's (back when she worked for the Horde) sends Adora a letter. In the letter, her Lani says that Hordak has locked her up in the Fright Zone and is threatening to send her to the slave pits on Horde World. When Adora enters the Fright Zone to save Loni, she finds out that she has been tricked into a trap. (thetvdb.com)