On the run from a monster, Adora, Glimmer and Bow stumble into an ancient First Ones ruin, while the Shadow Weaver orders Catra to bring Adora back.

The squad heads for the water realm of Salineas, ruled by Princess Mermista, but first they need a ship. Catra sets sail with Force captain Scorpia.

It's time for the Princess Prom, hosted by Princess Frosta. Adora wants to recruit her, but friend troubles and unexpected guests get in the way.

Adora enters the First Ones citadel with Catra on her tail. Inside, they're caught in an illusion simulator that brings back painful memories.

The Horde's bots attack the Woods, but the princesses can't capture one intact. Though Glimmer struggles with leadership, Catra has no such problems.

Adora and the princesses role-play plans for retaking a Horde fortress. With Scorpia in charge, the defenders face a challenge.

While Catra searches for Shadow Weaver, Adora and Glimmer follow Bow home and learn that he's been lying to his family.

Catra and Scorpia arrive in the Waste and have no trouble fitting in. Huntara and the squad enter Mara's ship to try to view her message.

King Micah and Queen Angella are shocked by Adora's story. With time to restore reality running out, Adora turns to Bow and Glimmer for help.

The village of Elberon throws a party for Adora, Bow and Swift Wind. A village girl named Flutterina helps when the Horde springs another trap.

After a disastrous mission, Mermista is certain there's a Horde spy in Bright Moon and vows to sleuth them out with her mystery novel experience.

The Princess Alliance is split on whether to use the magic at the Heart of Etheria or try to destroy it. Scorpia arrives with a request for help.

Glimmer tries to convince Scorpia to reconnect with her runestone. On Beast Island, Entrapta reveals dire new details about the Heart of Etheria.

While Adora takes a much-needed rest, Mermista reluctantly leads the princesses into the Fright Zone so Entrapta can try to trace Horde Prime's signal.

Adora surrenders herself to Horde Prime, hoping to buy time for Entrapta, Bow and Glimmer to rescue Catra and hack Horde Prime's server.

The squad heads to the planet Krytis to find a way to get past Horde Prime's blockade on Etheria. Shadow Weaver appeals to Castaspella for help.

The best friend squad heads for the Heart while the princesses attack the spire so Entrapta can disrupt the chip network. Horde Prime makes his move.