"Starfire the Terrible" is the twenty-ninth episode of Season 1 of Teen Titans Go!, and the twenty-ninth episode overall. It first aired on October 16th, 2013 on Cartoon Network.
Starfire turns evil so she can become Robin's arch enemy and make him eligible as the greatest super hero ever.
At the Jump City Rail Yard, Cinderblock attacks a train which is witnessed by Beast Boy, Cyborg, Raven, and Starfire. Raven asks if the Titans are going to stop Cinderblock, but Cyborg states they can't as it's a Monday. Riding his R-Cycle, Robin drives over the rest of the Titans exclaiming it to be Motorcycle Monday. The Titans reveal that Robin ordered the team to only fight with motorcycles on that day, which Beast Boy states is prejudice for Robin as the others don't posses motorcycles. Using the R-Cycle, Robin successfully defeats Cinderblock and cheers in victory.
Back at the Tower, Robin exclaims that he's the greatest superhero ever as he defeated Cinderblock with a motorcycle. As he puts the R-Cycle away, Robin is informed by Raven and Cyborg that he needs an archenemy to be a great superhero. Saddened by the fact that he lacks an archenemy, Robin begins to cry until Starfire comforts him by offering to be his archenemy. Cyborg proclaims that she needs to be a villain while Raven states that she can't be a villain by doing something nice. Beast Boy then challenges Starfire to prove she can be a villain by doing something evil. Starfire decides to prove it by drinking from the milk carton, but finds herself unable to do so. She then vows to be the greatest archenemy to Robin until she sees a smile on his face.
In her room, Starfire creates a supervillain uniform, finds her maniacal laugh, and enlists Silkie as her henchman. She creates an evil lair in front of the Tower where she claims will be the base for her evil plans and tea parties. In his room, Robin is throwing bird-a-rangs at his ceiling in boredom when Starfire enters and slams him into the wall. She asks if Robin is ready to pursue her only to be frustrated at every turn causing Robin to nervously laugh, stating it sounds creepy. Starfire wonders if he will once she does something that will make him hate her, and destroys a year supply of Robin's hair gel. Devastated and losing his spiky hair, Robin claims he has no choice but to combat Starfire which she cheers about. A can of hair gel rolls up to them, but Starfire destroys it before flying away.
Robin interrupts the other Titans' game in the living room where Beast Boy wonders about his hair. After trying to fix it to no avail, Robin reveals that his archenemy is on the loose. Raven reminds him that he doesn't have an archenemy, but Beast Boy figures out Robin is talking about Starfire. After laughing at this, Starfire enters the room by cutting a hole in the window. Cyborg and Beast Boy mock Starfire by sarcastically telling Robin that his archenemy is here to destroy them. Starfire states that no one can protect them from her villainy, but the Titans (except Robin) mock her by wondering if she'll drink out of the milk carton, set the wrong time for food in the microwave, or leave the sink running. Starfire claims that she rigged the moon to explode, which Cyborg continues to mock her about. However, at that instant, the moon explodes causing Cyborg to yell at her while Raven wonders why she would destroy the moon. Starfire responds that she knew how much Robin liked the moon and flies away after blowing up another of Robin's hair gel. Robin happily claims to a shocked Beast Boy, Raven, and Cyborg that he has a formidable archenemy.
Robin, Beast Boy, Cyborg, and Raven infiltrate Starfire's lair to put an end to her villainous ways, but she activates lasers made from cardboard and Deathbots to destroy them. Robin quickly defeats several of the evil robots while one throws the other Titans into a tank filled with metal piranhas which closes, trapping them. Robin defeats the last deathbot, and claims that it's down to just him and Starfire until the villain reminds him about her henchman. Silkie makes his way to Robin and vomits on the ground, causing him to trip and fall. Starfire happily proclaims she won, and activates a purple flame to finish Robin. Robin states she can't causing Starfire to wonder if he indeed asked for a formidable archenemy. Robin claims he only wanted to be a true hero causing Starfire to remind him that he is one. He asks if he can have one last request which Starfire agrees to. Robin asks what day it is and Starfire answers that it's Monday. Robin claims Starfire knows what that means while pressing a button on his communicator, causing his motorcycle to crash through the wall. Robin attacks Starfire with it, leaving her with a bruise before driving off exclaiming he beat his archenemy.
For a full transcript of "Starfire the Terrible", click here.
Running Gags: One of Robin's cans of hair gel rolls up to him and Starfire, exciting him until Starfire destroys it and flies off happily.
Deaths: Raven, Beast Boy, and Cyborg are trapped and possibly killed by Starfire's pirahnas.
Food Content: Starfire decides to drink from the milk carton to prove she is evil. Starfire staples a turkey to her evil lair. Raven is seen drinking milk when Robin claims his archenemy is on the loose.