Knowledge

"Knowledge" is the ninth episode of the second season of Teen Titans Go!, and the 61st overall episode of the series.

Summaryi
Starfire is tired of not being able to fit in with the other Titans, and asks Raven to help her to learn more about human culture. Raven casts a spell to give Starfire all of human knowledge, which turns Starfire into a total bummer.

Plot
The episode starts on the roof of the Tower where Robin is checking the wind and temperature. His calculations configure that is a perfect day to relax at the beach! Robin excitedly tells the other Teen Titans, and they are all pumped up to go. Suddenly, Starfire starts to yawn, alerting the other Titans. They gasp, explaining that a yawn is deadly contagious and will subside into sleeping. Robin seals Starfire in a protective cylinder to prevent anyone from catching the yawn, but to no avail. All the other Titans subsequently start yawning, and before long, all of them are asleep. They wake up at 10:00 p.m., and Starfire is contrite for ruining their day. However, the Titans are cool with her ignorance, but she complains that it isn't the first time her lack of knowledge of Earth culture has ruined the merriment. The others explain that is you know to much, you are a bummer (like Raven), but if you are completely un-knowledgeable (like Cyborg and Beast Boy),than you are awesome. Star wishes not be "the bummer".

Later that night, Raven floats by Starfire's room and hears crying in her room. She enters to see what's going on...Starfire is sobbing because of a misunderstanding where she had to set up Beast Boy on a blind date requested by him. Instead, she burned Beast Boy's eyes, leading him, well, being blind and crashing through the window. Still apologizing, she continues to cry. Raven offers her some help with knowledge lessons by explaining to her about it while singing and dancing. Starfire doesn't pick up with even after the song, so Raven takes the easy way out. She casts a spell that gives Starfire a magical, knowledge necklace. Or something like that...she wears it over night, acquiring vast knowledge and some cool glasses, too.

The next morning, Robin checks the weather's condition again. This time, the forecast is set for a perfect lake day. Everyone is psyched about it when Starfire interferes with the fun, stating that a lake is 46% polluted. Robin starts to worry about her and suspects Raven for helping her. Starfire claims that she prefers to be wise and not ruin perfect arrangements anymore. Robin then accuses her for ruining the day after all! Starfire starts mocking the knowledge about Raven's activities while the other Titans constantly yell "BUMMER!" In the end, Raven finally realizes that it was her fault for helping her, thinking it was an improvement. Starfire enters the room, and to everyone's astonishment, her brain has grown huge, terrifying the Titans. Raven confesses she used dark magic to give her all of the possible human knowledge there is. She explains that it's expanding too rapidly, and the only way to get rid of her knowledge is by entering her head and destroying it before her head explodes.

Raven summons the T-Sub for the Titans to explore Starfire's brain. It shrinks down and enters through Starfire's ear. The Titans try to nuke down some neurons while traveling in Starfire's head, but it fails (the neurons just regenerate). They had no choice but to go to the source, located in the brain. When they reach it, they behold a vast, dark purple orb, Starfire's Knowledge. Unwilling to give up, the Titans are forced to assault her knowledge. At first, she is able to overwhelm them using facts about missiles and lasers not working, but they are able to defeat it using ignorance to weaken her. They finish it off with a single laser blast, even though Starfire's Knowledge earlier commented that lasers don't hurt yet...how ironic. After they got out of Starfire's head, her brain resizes back to its original shape, and her normal alien thinking as her magic relic broke into pieces. Raven apologizes to Starfire, saying that she shouldn't have used dark powers from the first time. Raven says she should have educated her in the old fashion way (calculators, books, protractors) until the other Titans, so annoyed at her seemingly infinite knowledge, yell "BUMMER!"

Characters

 * Robin
 * Starfire
 * Raven
 * Beast Boy
 * Cyborg
 * Demon (cameo)
 * Starfire's Knowledge (debut)

Song

 * Mean What'cha Say

Trivia

 * This is the first episode of the second season to feature Raven's little buddy, the Demon.
 * This is the first time that Raven was seen wearing a bathing suit.
 * It is revealed that the Titans have something against yawning.
 * This episode is the debut of the T-Sub.
 * Starfires Knowledge continuously breaks the 4th wall by stating common facts, causing the Titans attacks to go astray.
 * The symbols on the magic amulet are, from the top and going clockwise - summation notation for adding 1/2s, norse runes, the Triforce from Zelda, the greek symbol psi (most commonly associated with the Schrödinger equation), the infinity symbol, the Laplacian, a stylized Rutherford-model  atom, and a crescent moon symbol. In the center is the mathematical constant pi.

Continuity

 * This is the fourth time Raven has been shown singing.
 * This is the tenth time that Raven was unhooded.
 * This was also the first time she was seen unhooded in chibi form while she was in a bathing suit.
 * Starfire once again talks using teen slang, which she did in "Dog Hand" and "Terra-ized".
 * This is the second episode where a Titan uses Raven's magic for intelligence, the first time was "Brain Food".
 * The Starfire's glasses are very similar to the one's Silkie wore in "Brain Food" when he became smarter.
 * Music from "La Larva de Amor" is heard in the montage where Starfire tells the Titans facts.
 * The forest Raven was playing with her dolls in was the same one where most of the episode took place in "Nature".
 * Raven's love for Pretty Pretty Pegasus was shown again.
 * This is the fifth time that Raven is seen playing with the Pretty Pretty Pegasus dolls. ("Legendary Sandwich," "Meatball Party," "Nose Mouth," "Be Mine")
 * This is the third episode where Beast Boy doesn't use any animal transformations. ("The Left Leg," "Waffles")
 * This is the first time the Titans shrink down and enter one of the Titans' bodies, this time Starfire's. The second time it happened with Cyborg in "Body Adventure".
 * When the Titans come in and out of Starfire's ear, there is a hole seen in her lobule. This could be a reference to Starfire wearing the green star earrings for her date with Speedy in "The Date."

Errors

 * Starfire was actually wrong when she said that 46% of lakes are polluted, while it is really 47%.

Running Gags

 * Raven saying "water", when the other Titans list off the great things to do on a holiday.
 * Robin, Beast Boy, and Cyborg yelling "BUMMER!" when somebody states a fact.