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I tried to warn you, Rapunzel. You have to be careful who you trust.
~ Cassandra betraying Rapunzel.
Cassandra is the tritagonist turned one of the main antagonists of Tangled: The Series. She initially starts off as a hero and supporting character, serving as Rapunzel's Lady-in-Waiting and one of her closest friends, but by the near end of season 2, she eventually betrays Rapunzel by taking the Moonstone for herself so she could fulfill her own "destiny" and is set to become the main antagonist of the third season.
She was voiced by Eden Espinosa as a young adult, and by Cassie Glow as a child.
Cassandra never knew her parents as a kid, as she was adopted and raised by the Captain of the Guards, and she has been training to join the Royal Guard since the age of six.
Cassandra is first seen waiting for Rapunzel's return from a ride with Eugene at Corona's village gates. From there, Cassandra takes Rapunzel to attend to the various duties of a princess, specifically in preparation for her upcoming coronation ceremony to officially crown her as heir to the throne. Rapunzel laments her feelings about the stress of the pressures of royalty overwhelm her.
Cassandra believes the princess should take a break regardless of what her father wishes, but Rapunzel refuses to do so. Later at a dinner event, Cassandra sits with Pascal, while Rapunzel sits with her parents, and Eugene sits at the children's table (an arrangement made by Cassandra, who was in charge of seating). Eugene takes the time to propose to Rapunzel, but due to her fears of being bound to live in the castle, Rapunzel rejects and leaves. Seeing the princess upset angers Cassandra, who glares at Eugene. She is Princess Rapunzel's best friend and the adopted daughter of the Captain of the Guards. She has a strong dislike for Eugene, but eventually warms up to him and is also a highly trained warrior.
In Season 2, she joins Rapunzel on her journey to follow the path of the Black Rocks, but as the season gradually progresses, their friendship becomes increasingly strained. She calls out Rapunzel for repeatedly doubting her judgment, and one instance of this causes her right hand to become severely disfigured and disabled by Rapunzel when she was trying to stop Hector. What seemingly breaks her is when Cassandra enters a room in the House of Yesterday's Tomorrow after hearing a mysterious voice, and is not seen again until Tromus is defeated and the house is destroyed and then a door mysterious appears and Cassandra comes out of it, f then Rapunzel rushes up to her, she scowls at the Princess and flinches when she hugs her.
The following episode hints at a change in her when Eugene receives a prophecy saying that one person in their group will betray Rapunzel at the Dark Kingdom. Cassandra flashes a sinister smile when Eugene looks at her.
Although it seems that Eugene himself unwittingly fulfills this prophecy, Cassandra steals the Moonstone just as Rapunzel is about to take it. She bonds with its power, which changes her appearance and makes her the Moonstone's human vessel, the opposite of Rapunzel.
Powers and Abilities
Cassandra is a skilled swordswoman and fighter, having trained in the ways of the Corona Royal Guard since she was six years old. She is adept with many types of weapons, as shown through her collection of them in Before Ever After. She can handle her own in most fights, easily taking down Lance Strongbow, a world-renowned thief, as well as some of the Seven Kingdom's toughest fighters, as seen in Challenge of the Brave.
However, she is not unbeatable, as she is overwhelmed by warriors who have trained longer than she herself has been alive, such as Adira and King Edmund of the Dark Kingdom. Following her bonding with the Moonstone, she has most likely gained the life-draining abilities that it possesses, as shown through its power coursing through her hair.
Cassandra's sinister smirk foreshadowing her true nature.
Cassandra grabs the moonstone first before Rapunzel does.
Cassandra's evil stare to Rapunzel after she snatches the moonstone from her.
She had been training to join the Royal Guard since she was 6.
She is very similar to Varian, another one of Rapunzel's allies who turned against her. Like Varian, Cassandra started off as a close ally and friend to Rapunzel. Her journey to the Dark Kingdom, however, began to strain her relationship with the Princess, ultimately ending with her betrayal of her closest friend.
She is four years older than Rapunzel.
Her betrayal could be hinted early in the final episode of Season 1 when during the song "Ready as I'll ever be", in the case it's the phrase "So they can trust me.".
Cassandra is the Tangled character to hide her true nature the longest.
The downfall of Cassandra to the villainy could be similar to Venom (Marvel) of The Spectacular Spider-Man animated series.
Both used to be good friends with Rapunzel and Peter Parker. Nevertheless, in some instances, Cassandra and Eddie showed harbor certain envy and resentment for the success of Rapunzel and Peter.
Their friendship with Rapunzel and Peter began to be strained after some events of their respective series (Cassandra's arm ends disabled because Rapunzel refuse to listen her judgment/Eddie lost his job because Peter refuse to return the symbiote to the laboratory).
Both became villains after being exposed to a mysterious power that make them powerful beings and changes their normal physical appearance (The opal / The symbiote).