Rapunzel's Tangled Adventure (season 3)

• Angry and Red's real names are revealed to be "Kiera" and "Catalina".

When the Enchanted Girl tells Cassandra she must destroy Rapunzel in order to wield the Moonstone's true power, Cassandra discovers that she can create, with fear, red rock spikes that cause fear and freeze their victims. Varian discovers the red rocks and teams up with Rapunzel to use his amber solution on them. Meanwhile, Eugene and Lance decide to throw a talent show to distract everyone from their fears. Though initially a failure, it succeeds when Lance faces his fear of singing in public and encourages everyone to face their own fears. Rapunzel and Varian make their way to the Demanitus chamber. Varian, who is haunted by the memory of what the amber did to his father, can not bring himself to use the solution. Rapunzel, who has been hiding her fear, reveals that she is afraid of losing Cassandra as a friend and of her destroying Corona. At the last second, Varian tackles his fears and encases the rocks in amber, saving Corona, and people begin to respect him again. The Enchanted Girl tells Cassandra that Rapunzel will take all her newfound power and destroy her, and convinces Cassandra to kill her former friend. Rapunzel, who sensed Cassandra's fear through the rocks, tells Eugene that there is still a chance to save her.

• Catalina (Red) briefly transforms into her werewolf form at the start of her and Kiera’s (Angry) portion of the show, unintentionally scaring the audience.

With an implication from Owl, Rapunzel and Eugene board a hot-air balloon and return to Tirapi Island, where the Lorbs dwell, in the hope of finding Cassandra. However, they instead meet up with the Captain of the Royal Guards who has been looking for Rapunzel for months but decided to remain on the island with the Lorbs. He then introduces them to a four-year-old Cassandra, who appears to be enjoying being with her adoptive father. From their Lorb leader friend, Rapunzel and Eugene learn of a mystical fountain which grants the wishes of those who drop a Lorb coin into it, but on the ninth day, darkness shall descend onto the wisher. Eugene and Rapunzel try to warn the Captain, but he refuses to listen as he desires to have his daughter back. He reveals he found Cassandra during his search, but strongly believes that the furious woman he had encountered is not his daughter. The wish's darkness arrives, causing hundreds of different Cassandras suddenly attack. The Captain attempts to flee in the balloon with the four-year-old Cassandra but upon seeing she has no shadow, he comes to his senses and removes the coin from the mystic fountain which, in turn, makes all the Cassandras vanish. And so Rapunzel, Eugene and the Captain return to Corona, determined never to give up on the real Cassandra.

Cassandra returns to the Spire to steal the Mind Trap, a device that can control anyone who has sworn loyalty to the Moonstone, from Calliope. Calliope sends a letter to Rapunzel for help and she and Eugene set out by hot air balloon. They pass through the frozen tundra of Krestin Lock where they are shot down and reunite with Calliope who claims to have escaped. They battle their way through the fish like natives, but Rapunzel rescues a couple as they leave. They arrive at the Spire where "Calliope" asks for the key to unlock the chest containing the Mind Trap, but Rapunzel sees through the ruse; Cassandra reveals herself and "Calliope" is Zhan Tiri in disguise.

Two kids visit Gothel's old house where they are seemingly attacked by her ghost. Rapunzel, learning of this, travels to the house, only to encounter Cassandra, who had been told by Zhan Tiri to investigate the rumors. As the two fight once again, they cause the house to tip over and they fall into a mine. After escaping poisonous gas, Rapunzel and Cassandra are attacked by a giant mole and bats. They team up to escape into a room full of magic mirrors that Gothel used to record her talking about herself, where Cassandra discovers what Gothel was really like through he vain recordings, though one seems to be missing, which Zhan Tiri slips into Rapunzel's bag.

After having a nightmare about Cassandra at her stronghold, the Captain of the Royal Guard steps down from his position and hands his title over to Eugene. Eugene is unsure about being chosen as the new captain, but is distracted by the news that there is a new thief who bares a remarkable resemblance to Eugene, also going by the name Flynn Rider, who has stolen the crown again. Eugene, Rapunzel, Maximus and Pascal take off to go look for the thief while Lance is left in charge of watching over Varian's new invention: The Rooster, a large machine that warns of Cassandra's imminent attack. Lance, however, soon messes with the machine, resulting in a large explosion that leaves him temporarily deaf.

Rapunzel rallies all of Corona together to take back the kingdom. Varian learns that Lord Demanitus made a machine that trapped Zhan Tiri in another world called "the Lost Realm" for millennia. Rapunzel, Eugene, Pascal, Varian, Lance, Angry and Red venture to Lord Demanitus' tomb to get the plans. They realize that they have to build the machine close to Zhan Tiri and the Coronans proceed to storm the castle. Rapunzel faces off with Cassandra, but with the impending eclipse, Rapunzel's powers begin to wane. The Coronans successfully build the machine, but Hamuel accidentally activates it, sucking everyone in, except Eugene and Edmund. The Brotherhood, still affected by the Mind Trap, attack the two and they race to Cassandra's tower to destroy it. However, Edmund is revealed to also be affected and Maximus rescues Eugene. Eugene gets through to Edmund who willingly destroys the Mind Trap. They return and rescue the Coronans.

With the solar eclipse in full effect, Cassandra defeats the weakened Rapunzel, but Zhan Tiri steals both the Sundrop and the Moonstone, rendering both Princess Rapunzel and Cassandra completely powerless and transforming herself into a giant squid-like demon while destroying the machine in doing so. While the Coronans alongside Adira, Hector and King Edmund battle against Zhan Tiri, Rapunzel and Cassandra make up. Inspired by the phrase in Rapunzel's book "Plus Est En Vous", Cassandra takes the broken piece of the moonstone from their earlier fight and gives it to Rapunzel; giving her hair just enough Sundrop energy. They battle Zhan Tiri and force her to merge the Sundrop and Moonstone gems together at the cost of Rapunzel cutting her brown hair short again. Zhan Tiri is finally destroyed as the moon rocks disappear as the Sundrop and Moonstone finally become one Rapunzel uses it to save everyone before sending the Ultimate Power of the Heavens back where it belongs.