"Betrayal" is the twenty-third episode of Teen Titans series and the tenth episode of the second season.
The episode opens on a power plant being robbed by Slade's robots. They are about to make their escape when they are stopped by the Titans, including Terra. The Titans swiftly defeat the thieves, with Beast Boy coming to Terra's aid in the midst of the battle. Later, Slade is in his lair observing images and videos from the battle, as well as weapons and paraphernalia belonging to the Titans, supplied to him by an unknown character. Slade congratulates his accomplice and says to stick to the plan and by tomorrow the Teen Titans will be destroyed. The only clue to the identity of the mysterious figure is a bright blue eye staring out from the darkness.
Back at Titans Tower, the Titans award the last slice of pizza to Terra for her superb efforts and mastery of her powers and throw a small party for her. She tries to shrug it off, saying it's no big deal. Beast Boy says that good friends like her don't come along every day. Cyborg locks down the Tower and the Titans retire for the night. Terra goes to her room and sends off an e-mail to an unknown character before Beast Boy knocks on her door. Although nervous, he presents her with a small package, declaring that he made something for her. Terra opens the package and finds a heart-shaped box with a mirror on the inside of the lid. Terra is moved and doesn't know what to say. Beast Boy replies, "You can say 'yes' because I'm about to ask you on a date." He asks her if tomorrow is okay, but Terra suddenly becomes mortified and abruptly retreats to her room saying, "I just can't". Back in his room, Beast Boy is busy reprimanding himself for not being more calm when asking her out, and thinking of different ways to change her mind; just when she appears outside his window, saying she wants to go out with him tonight. Just as they leave the Tower, Cyborg wakes up and goes to the kitchen for a snack, but finds an enormous army of Slade's robots waiting in ambush.
Terra takes Beast Boy out of Jump City to a small restaurant where she frequently visited before she became a Titan. They order food, but Terra quickly whisks Beast Boy off when she sees an image of Slade in the restaurant, unbeknownst to him. She pulls him away so suddenly that Beast Boy drops his communicator just as Robin begins calling him for help. The other Titans are fighting for their lives back at the Tower against an army of Slade's robots, realizing that Terra is gone as well. Cyborg cannot figure out how they bypassed his security and got into the Tower so easily. Meanwhile, Beast Boy and Terra are visiting an abandoned theme park. Terra seems rather distant and distracted. Beast Boy tells her that it's okay if she's not having fun with him, but Terra smiles and says that he is "her definition of fun". They both have a wonderful time riding bumper cars, playing games, and taking pictures together and form a close romantic connection. Later that night, they are alone on the Ferris wheel and Terra asks if Beast Boy would still be her friend even if he knew something bad about her, feeling that she can trust him to be a real friend. Beast Boy promises her unhesitatingly and is about to kiss her when Slade appears and attacks.
Beast Boy fends Slade off by himself as best he can and the fight ends with Terra bringing the Ferris wheel down on top of Slade as Beast Boy escapes the wreckage. They then take refuge in the house of mirrors where Beast Boy realizes he has lost his communicator. He says that they have to get back to Titans Tower, but Terra says she is not going back. Slade reappears and states that Terra has become his apprentice. Beast Boy fiercely asserts that he is lying, but Terra confirms it to be true. Flying into a rage, Beast Boy attacks Slade with all his might while Terra retreats to another part of the house. She becomes distraught and regretful, apologizing to Beast Boy and saying that she didn't want any of this to happen. Beast Boy appears, angry at her betrayal and that she had been pretending the entire time. Terra reminds Beast Boy of his promise to always be her friend, but he turns his back on her and says that she has no friends. Stricken at this, Terra leaves with Slade, who states that they've had a change of plans, apparently angry that the plan had failed.
The next morning, Titans Tower has been torn apart, but all of Slade's robots and machines have been destroyed. The Titans are dejected over Terra's betrayal and Starfire says that the outcome does not feel like a victory. The final shot shows Beast Boy in Terra's room, curled up on the bed as a dog with the heart-shaped box he made for her, heartbroken over losing Terra.
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- The title refers to Terra betraying the team's trust for Slade.
- This was the first episode to premiere on the Toonami block, as well as the first episode to air during the CN City era of the channel.
- When Terra appears on a floating rock outside Beast Boy's window, she asks him to go out with her. Her request surprises Beast Boy as Terra rejected him the first time he asked her. He is also confused to why she didn't knock on his door and confronts her about it. Terra doesn't answer the question, and instead holds out her hand, and asks "Do you trust me?" just as Aladdin did while on a flying carpet in the famous Disney film.
- When Beast Boy is playing through different scenarios on how him asking Terra out could have gone, the production number on the cue card is 257-330, the production code for the episode. "Soto" (last name of the director for this episode) can also be seen on the Director line.
- The scene when Terra destroys the Ferris Wheel and tells Beast Boy to fly is probably a call back to Beast Boy's past. In the comics when Beast Boy & his parents where caught in a flood & Beast Boy's mother told her son to fly to save his life. The bird that Beast Boy changed into was a small bird, the same kind that he changed into in this episode.
- The scene when Beast Boy smashes all the mirrors in the House of Mirrors is a reference to the movie Enter the Dragon when Bruce Lee smashes all the mirrors in a mirror room to track down the location of Han, the main villain so he can't continue hiding with the reflections.
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