Teen Titans Go! Wiki
Teen Titans Go! Wiki

"Brain Percentages" is the twenty-fourth episode of the fourth season of Teen Titans Go! and the one-hundred-eighty-first overall episode of the series.


Beast Boy starts using more than 10% of his brain in an effort to find the hidden images in a puzzle.


Robin, Cyborg, and the girls gather in the living room, trying to solve a puzzle that involves searching for hidden pictures. They've already spotted the feather and beach ball in the camel humps, broccoli in the cloud, and the rocket ship at the side of the treasure box...until Beast Boy pops up and sees the hidden pics puzzle. However, he struggles to find the dolphin and keeps getting distracted by the already visible objects in the picture. Cyborg reminds him that he has never succeeded in these brain games and tries to convince him to play stupid video games, but unlike usual, he isn't swayed even though everybody hints at him. Unfortunately, no matter how he squints his eyes, he still fails.

Quickly, Beast Boy submits into frustration. To reassure him, Starfire informs him that it's his brain having the problem, though he denies it and believes that he needs to try a bit harder...with the lobes on different parts of his body. Robin disagrees and states that humans only use 10% of the brain, and Raven teases Beast Boy on only using 2%. Although Cyborg clarifies that the 10% brain theory is merely a misconception used by the television industry...and it's reasonable for Starfire to freak over learning the wrong knowledge from fiction! (Including a rumor that the 2003 Teen Titans are making a comeback for Season 6). Anyway, Beast Boy interprets that he will be able to do the puzzle if he uses more percentages of his brain, and since his friends are terrified that his brain is super shriveled, he knows that it's time for it to get some strenuous training!

Later, having acquired 10% of his brain, Beast Boy decides to rename himself "Renaissance Boy," which Starfire admires. However, he still can't find the dolphin in the picture book. He conspires to get more percentages, but Robin states that he's at 2%, which is the maximum amount a person can use. Nevertheless, Beast Boy's determined to unlock his brain's true potential.

Later that night, The other Titans are laughing at a joke Cyborg made, but Beast Boy insults him, saying that he's always using it to hide the painful conflict of his soul and calling him a misfit of the human race, thus making him run off crying. Starfire wonders why he's being cruel to him, to which he explains that he's using 50% of his brain, so he's got some deep insights about people. He also soon insults Robin, Raven, and Starfire, making them cry and run out of the kitchen. Cyborg wonders why he is doing this, and Beast Boy says it's so that he can solve the picture book puzzle, only to once again fail at doing so. The others are worried that he could manage to unlock 100% of his brain, so Cyborg comes up with a plan to get him back to his old dumb self.

In Beast Boy's room, Beast Boy is meditating until he is interrupted by Cyborg with a TV screen, who suggests playing some video games. But he refuses because he does not want to lose all his brain percentages. The others say that they love him the way he is, but he says that he using 80% of his brain, which makes him hover and do a coin trick. However, it's not enough brainpower. So Beast Boy decides to do the unthinkable: Go back in time 650,000,000 years into the past and touch fingertips with a monkey. After doing so, He tells the others that he's using 95% of his brain and he's going to turn himself into a computer. That's when a transformation sequence occurs, and he tells the others that if they were him, they'd touch fingertips with monkeys and be computers too. Cyborg tells him to stop, but he refuses and says that he's about to reach 100%, thus destroying reality. The Titans try to stop him, But it is too little too late, as he reaches 100% and teleports them and himself inside the picture book so that he can find the pictures. Cyborg urges him to restore reality. However, Beast Boy claims he won't until he can finish the puzzle. He finds almost everything in the picture, except for the dolphin. The Titans try to tell him the dolphin is on the palm tree. However, he once again refuses to listen to them. Therefore, the dolphin slaps him in the tail, which makes him see it, though he retorts that they should make these games harder, much to the other Titans' confusion. With that, they are teleported back to reality. Raven wonders what Beast Boy will do now that he has the unlimited power of his brain, but it turns out he hasn't thought that far ahead until he finds a maze puzzle, much to the other Titans' cringe.

Sometime later, the Titans are now in the maze made of cheese, unable to get out despite it being simple, all thanks to Beast Boy's stupidity. The episode ends with Cyborg thinking that he and the others are never getting out of the maze.


Major Characters

Minor Characters


  • This is the fourth episode in the series about a Titan trying to expand their intellect. The other episodes are "Brain Food", "Knowledge", and "Head Fruit".
  • In the live-action segment with Beast Boy doing a coin trick, the actor is wearing a shirt with a design of Beast Boy's costume on the front. This shirt just happens to be official Teen Titans Go! merchandise you can purchase from Cartoon Network's website.
  • This was aired one year after "The Art of Ninjutsu".
  • Cyborg is right about the 10% brain usage myth. It has been proven by scholars and other professionals alike that we do use our full brain all the time.


  • At the end of "Brain Food", Beast Boy is said to no longer have a brain but in this episode, he seems to have it restored.
  • At the end of "Head Fruit," Beast Boy's brain was seen to run away for freedom in the sky. However, it seems to have returned to his subconsciousness now.
  • Music from "Salty Codgers" is reused.
  • The puzzle book the Titans are enjoying is Hidey-Town, the same important periodical that Cyborg was reading at the dentist's office in "Meatball Party".
  • Beast Boy wears his "Shakespeare" outfit again. He wore it for the first time in "BBRAE" (Part 1) when trying to impress Raven by reading her a love poem.


  • The hidden picture puzzle book that is titled Hidey-Town the Titans are viewing at the beginning is similar to a real series of books that are titled I Spy.
    • It also resembles the hidden-image illustrations that appear in every episode of Highlights magazine.
  • Beast Boy traveling back in time to touch fingertips with a monkey man and then becoming a supercomputer parody similar scenes from the 2014 film, Lucy.
  • When Cyborg mentions how the 10% brain myth is mostly used as plots for books, TV shows, and movies, images appear that reference The Riddler, The Brain (his name once again misspelled as "Brian"), Brainiac, Lex Luthor, and Superman.
  • When Beast Boy turns into a full computer, his body shape and model looks somewhat similar to BMO, from Adventure Time, another show on Cartoon Network which Hynden Walch starred in.
  • When Robin refutes Cyborg's claim that TV shows are dishonest, an image promoting that a sixth season of the original Teen Titans series is coming soon suddenly pops up.
    • The 2003 Teen Titans "Season 6 Coming Soon" is a jab at the detractors that it might never return for a sixth season at all...
  • At 50% brainpower, Beast Boy shares deep insights about that Titans. He brings up the dramatic inner struggles that are better associated with their more serious incarnations, such as Raven's need to control her emotions and Starfire's isolation from the people of Tamaran
  • When Cyborg mentions a duck saying "put it on my bill", this is a reference to "The Duck Song", which is a popular song about a duck wanting grapes.


  • Beast Boy said that Starfire is the only alien on earth, but he's wrong. Superman and Supergirl are also extraterrestrial beings who lived on Earth after their homeworld Krypton got destroyed.
    • However, he could have meant that Starfire is the only Tamaranian on earth, which (not counting Blackfire) is technically true.

Running Gags

  • Beast Boy constantly getting frustrated over solving childish puzzles, even as his brain percentages go up.
    • In this case, it's struggling to find the dolphin.
  • Beast Boy not being able to solve the puzzles and raising his brain percentages to solve them.
  • Beast boy insulting the other Titans in the process of making his brain percentages go up.


The transcript for "Brain Percentages" can be found here.


Click here to view more images from Brain Percentages.
The image gallery for Brain Percentages may be viewed here.

v - e - d Episode Guide

Season 1: April 23, 2013 - June 5, 2014
Legendary SandwichPie BrosDriver's EdDog HandDouble TroubleThe DateDude RelaxLaundry DayGhostboyLa Larva de AmorHey Pizza!GorillaGirl's Night OutYou're Fired!Super RobinTower PowerParasiteStarliarMeatball PartyStaff MeetingTerra-izedArtful DodgersBurger vs. BurritoMatchedColors of RavenThe Left LegBooksLazy SundayStarfire the TerriblePower MovesStaring at the FutureNo PowerSidekickCaged TigerSecond ChristmasNose MouthLegsBreakfast CheeseWafflesBe MineOppositesBirdsBrain FoodIn and OutLittle BuddiesMissingUncle JokesMás y MenosDreamsGrandma VoiceReal MagicPuppets, Whaaaaat?

Season 2: June 12, 2014 - July 30, 2015
Mr ButtMan PersonPiratesMoney GrandmaI See YouBrianNatureSalty CodgersKnowledgeSlumber PartyLove MonstersBaby HandsCaramel ApplesSandwich ThiefFriendshipVegetablesThe MaskSerious BusinessHalloweenBoys vs GirlsBody AdventureRoad TripThanksgivingThe Best RobinMouth HoleHot GarbageRobin BackwardsCrazy DaySmile BonesReal Boy AdventuresHose WaterLet's Get SeriousTamaranian VacationRocks and WaterMultiple Trick PonyTruth, Justice and What?Two Bumble Bees and a WaspOil DrumsVideo Game ReferencesCool SchoolKicking a Ball and Pretending to Be HurtHead FruitYearbook MadnessBeast ManOperation Tin ManNeanCampfire StoriesAnd the Award for Sound Design Goes to RobThe HIVE FiveThe Return of SladeMore of the SameSome of Their Parts

Season 3: July 31, 2015 - October 13, 2016
Cat's FancyLeg DayDignity of TeethCroissantSpice GameI'm the SauceHey You, Don't Forget about Me in Your MemoryAccept the Next Proposition You HearThe Fourth Wall40%, 40%, 20%Grube's FairytalesA FarceScary Figure DanceAnimals, It's Just a Word!BBBDAY!Black FridayTwo ParterThe True Meaning of ChristmasSquash & StretchGarage SaleSecret GardenThe Cruel Giggling GhoulHow 'Bout Some EffortPyramid SchemeBeast Boy's St. Patrick's Day Luck, and It's BadThe Teen Titans Go Easter Holiday ClassicBatman v Teen Titans: Dark InjusticeBottle EpisodeFinally a LessonArms Race with LegsObinrayWally TRad Dudes with Bad TudesOperation Dude RescueHistory LessonThe Art of NinjutsuThink About Your FutureTTG v PPGCoconut Cream PiePure ProteinOpen Door PolicyCrazy Desire IslandThe Titans ShowBooty ScootyWho's Laughing NowOregon TrailSnuggle TimeOh Yeah!Riding the DragonThe OverbiteThe Cape

Season 4: October 20, 2016 - June 25, 2018
Shrimps and Prime RibHalloween v ChristmasBooby Trap HouseFish WaterTV KnightTeen Titans Save ChristmasBBSFBDAY!The StreakThe Inner Beauty of a CactusMovie NightBBRAEPermanent RecordTitan Saving TimeThe Gold StandardMaster DetectiveEaster CreepsHand ZombieEmployee of the Month: ReduxThe AvogodoOranginsJinxedBrain PercentagesBL4Z3Hot Salad WaterI Saw You DanceThe Story in Your EyesPlaying Hard to GetThe Night Begins to ShineLicationLabor DayClassic TitansOnes and ZeroesCareer DayTV Knight 2Justice League's Next Top Talent Idol StarThe AcademyCostume ContestThrone of BonesDemon PromThanksgettingThe Self-Indulgent 200th Episode Spectacular!BBCYFSHIPBDAYBeast GirlFlashbackBro-PocalypseMo' Money Mo' ProblemsTV Knight 3

Season 5: June 25, 2018 - April 4, 2020
The Scoop!Chicken in the CradleKaboomsTower RenovationMy Name is JoseThe Power of ShrimpsMonster SquadReal OranginsQuantum FunThe FightThe GrooverJustice League's Next Top Talent Idol Star: Second Greatest Team EditionHow's this for a Special? SpaaaaceBBRBDAYSlapping Butts and Celebrating for No ReasonNostalgia is Not a Substitute for an Actual StoryBusiness Ethics Wink WinkGenie PresidentTall Titan TalesI Used to Be a PeoplesThe Metric System vs FreedomThe ChaffThem Soviet BoysLittle ElvisBooty EggsTV Knight 4Lil' DimplesDon't Be an IcarusStockton, CA!What's Opera TitansForest PiratesThe BergeracSnot and TearsCampfire!What We Learned at CampCommunicate OpenlyRoyal JellyStrength of a Grown ManHad to Be ThereGirls Night InThe Great DisasterThe Viewers Decide

Season 6: October 4, 2019 - present
Butt AtomsTV Knight 5Witches BrewThat's What's Up!Crab ShenanigansBrobotsBrain FlipBeast Boy on a ShelfChristmas CrusadersWe're Off to Get AwardsBat ScoutsWalk AwayRecord BookMagic ManTitans Go CasualRain on Your Wedding DayEgg HuntJustice League's Next Top Talent Idol Star: Justice League EditionMission to Find the Lost StemsDrumsGuitarBassYou're The One

Top of the Titans: April 27, 2018 - July 20, 2018
Raddest SongsBest Love SongsBeast Boy & Cyborg SongsDance PartyBest Rivals