Heart Part 1.The rebels prepare for their final strike against Horde Prime. While the others create a distraction for Entrapta to destroy the hive network, Adora, Glimmer, and Bow descend to the Heart of Etheria. Believing that the Heart's destruction is her sole purpose in life, Adora leaves her friends behind. Prime begins tapping into the Heart, and upon noticing Entrapta's meddling, teleports her aboard his flagship. Fearing for Adora's safety as Prime begins to connect to the Heart, Catra reluctantly teams up with Shadow Weaver to follow Adora, while Bow, Glimmer, and Melog set out to rescue the other princesses...