"Terra-ized" is the twenty-first episode of Season 1 of Teen Titans Go!, and the twenty-first episode overall. It first aired on 20 August 2013 on Cartoon Network.
Beast Boy thinks the villainess Terra is his new girlfriend, but she is just using him to gain access to all of the Titans' secrets. Only Raven suspects Terra, but the others just think that Raven is jealous.
Robin wakes up for the day, exclaiming that it's going to be a great morning. He launches into a song celebrating the beginning of the day and greets the other Titans as he makes his way down the hallway, through the kitchen, and into the living room. He spots a stranger going through the Titan computer and freaks out, activating a lockdown system that shuts Titans Tower's windows, the refrigerator, and restrains the intruder. Robin prepares to attack, but Beast Boy stops him. He deactivates the lockdown and introduces the stranger as Terra, his new girlfriend, a label she objects to. The other Titans gather around the couch to meet Terra when Robin asks for an explanation on how she entered the tower. Beast Boy reveals that he gave her the security codes and Cyborg tells Beast Boy that he and Terra sound serious. Starfire asks for the story on how the two met and Beast Boy explains that it's a typical love story: he met Terra and fell for her while she asked for access to the tower and schematics of its defense capabilities.
Raven, suspicious of Terra, wonders why someone like her would want to be with Beast Boy and she answers that she likes how trusting he is. Beast Boy mentions that Terra also has superpowers and suggests that she’d be a great addition to the Teen Titans. Robin, intrigued by the idea of a new Titan, tells Terra to demonstrate her abilities. She geokinetically controls a rock (that has a seagull on it) and slams it onto Raven, knocking her to a lower level. Robin praises Terra's ability, but says that Terra will have to pass a series of carefully designed tests if she wants to become a Titan and tells her to be prepared for anything. Beast Boy offers to lead Terra in a tour of the tower and reaches for her hands, but she pulls away and angrily reminds him that she specifically said no touching. As they walk down the corridor, Robin reveals himself in a bush and chases after Terra, who calmly maneuvers around him until he falls. He praises her skill, but tells her that there will be more Titan Tests. Meanwhile, Raven floats back into the living room and shares her suspicions about Terra with Starfire and Cyborg. However, Starfire claims that Raven just doesn't like how Terra is stealing Beast Boy from her.
Beast Boy takes Terra to one of the tower's secret compartments which holds the mainframe computer. Terra tells Beast Boy that it looks beautiful and he leans in to kiss her, but she recoils away in disgust. She asks him to retrieve her camera, but Beast Boy tells her that they're not supposed to be taking pictures in the room. She goads him with the prospect of taking a picture of their first kiss and he transforms into a cat and runs out of the room, determined on finding it. As soon as he leaves, Terra takes out a phone and reports to an unknown employer that she's gained access to the computer and that their plan of destroying the Titans is going as planned. Beast Boy returns to the room, still looking for the camera as Terra hides the phone.
As Terra is exploring the tower, she opens the refrigerator when Robin jumps out, announcing another Titan Test. Startled, Terra slams his face between two rocks and apologizes, claiming that she was simply looking for milk. He tells her that he earned her milk and that the next Titan Test won't be as easy. Meanwhile, Starfire asks Beast Boy how his relationship with Terra is progressing and he says that things are getting serious as she's asking for his hopes and dreams, his pass codes and security clearances and the rest of the Titans' information as well. Raven, having overheard, asks Starfire and Cyborg if they can see what she was talking about. Cyborg tells Beast Boy that he believes she is in love with him due to her constant need to know everything little thing about him and the Titans. Raven suggests that it sounds like Terra is gathering information on them, but Starfire and Cyborg say that it sounds like Raven is jealous. Beast Boy says that it's sweet for Raven to be jealous, but that he has already found his match. He goes to give Raven a friendship hug, but she veers around him and tells the others that she hates them before retreating into the elevator. Before the doors can close, Cyborg pries them open and claims that Raven has a huge crush on Beast Boy. She slams him, Starfire, and Cyborg into the ground and exits. Beast Boy informs the others that he's late for a date with Terra in the Titans' Secret Lair and heads there.
In the secret lair, Terra is going through the mainframe computer when Beast Boy enters with a box of chocolates and a bouquet of roses. He asks Terra why she chose the secret lair as the location for their date, but Terra clarifies that she didn't say date, but data (as in data transfer.) She explains that she wants to put the Titans' sensitive files onto her flash drive which Beast Boy says sounds romantic. He dims the light and approaches Terra for a kiss, but she summons a boulder to knock him out of the tower. He flies back up to the secret lair and agrees to kiss after the transfer which he proceeds to do. Terra exclaims that the plan worked too easily, but Beast Boy assumes she is talking about love. He leans in for a kiss, but she summons a pebble to knock him out. Unbeknownst to Terra, Raven had conjured a demon to spy on her.
Cyborg and Starfire are watching their daytime talk shows when Raven enters, having trapped Terra with a fist from her soul-self. She reveals to the Titans that she spied on Terra and confirmed her suspicions that she had been collecting information on them to take them out. Cyborg and Starfire, however, see this as proof that Raven is completely jealous of Terra and apologize to her for Raven's actions. Raven, enraged, offers to show them the evidence she collected when Robin announces another Titan Test. He loads himself into a cannon and shoots out of it, slamming into his teammates and knocking them out. Freed, Terra smiles evilly and ties up the Titans, leaving them to dangle over the edge of the tower.
Raven tells the Titans if they finally realized that Terra was using Beast Boy to get information on them, but Robin agrees with Starfire and Cyborg, claiming that she's jealous. Terra bids the Titans good-bye as she intends to sell their sensitive files to the villain world. Before she can leave, however, Beast Boy shows up, demanding to know what’s going on. He falsely assumes that she is leaving without telling him good-bye and Terra claims that things are getting too intense between them. Cyborg motivates Beast Boy to go after her and he does, telling Terra that she can’t tell him she doesn't feel anything. Terra, deciding to show Beast Boy how she really feels, summons a giant boulder from the island to crush him. Raven uses her magic to free himself and manages to save Beast Boy by destroying the boulder. She and Terra proceed to battle with Terra shooting rocks at Raven. Raven uses her soul-self to create a shield then throws it at Terra, knocking her off her platform and onto the tower’s roof. She opens a portal to another dimension and transports Terra and a piece of the tower into it, upsetting Beast Boy who believes that Raven stopped Terra from telling him her true feelings.
Back in the tower (which has a giant chunk missing due to Raven and Terra's battle), Cyborg apologizes to Raven for assuming she had romantic feelings for Beast Boy, dismissing it as silly. Beast Boy, offended, asks why it's silly and Starfire answers that he lacks redeeming qualities. Raven scoffs at the thought of her and Beast Boy and turns around, hiding a smile.
For a full transcript of "Terra-ized", click here.