Mr Butt

Mr. Butt is Teen Titans Go! Season 2, Episode 1a (27a), and the 53rd overall episode of the series.

This episode is the Season 2 Premiere.

Summary
Blackfire pays a surprise visit to her sister, Starfire, saying she wants to spend some quality time with her. The other Titans think that Blackfire is playing another trick, but Starfire is sure that this time Blackfire is serious about reviving their sisterly love.

Plot
One beautiful morning, Starfire is out watering her flowers. Before she can finish, a giant robot smashes falls out of the sky and crashes on top of her garden. Starfire looks up to see her sister, Blackfire, in handcuffs and fighting robots. Starfire quickly joins her sister in fighting the robots. Once the robots are defeated, Blackfire tells her sister that she is there to visit her because she missed her. Starfire becomes filled with excitement and asks Blackfire if she will join her in some sister bonding activities.

Starfire enters the living room and announces to her friends that her sister has come for a surprise visit. Robin grabs Starfire and pulls her into the kitchen. He reminds her of all of the terrible things Blackfire has done, and that she is a dangerous criminal on the run. Starfire explains that she is convinced that Blackfire really has changed, and will give her one last chance. She also says that if Blackfire tricks her again, she will unleash all of her fury onto her and everyone who stands in her way. Blackfire interrupts her, asking if she wants to dye her hair.

The two sisters begin a montage of "sister fun time" activities, such as painting their nails, dancing, brushing each other's hair, and lastly, cutting and dyeing Starfire's hair to match Blackfire's hair. Once they finish, Blackfire decides that Starfire needs a different outfit, and grabs some clothes just like hers. She slips them onto Starfire, and backs up away from the tower window. Starfire begins to explain to Blackfire how much their bonding means to her, but is interrupted when a robot shoots her in the back from outside the window. The robot grabs Starfire, thinking she is Blackfire because Blackfire had pointed to the robot and said "That's Blackfire! The one you're looking for!" and the robot flies into space with Starfire in its grasp.

Deep into the void of space, the robot stops at a prison, and locks Starfire into a prison cell. Back at the Tower, Robin is doing some exercise routines. Blackfire floats up behind him, and tells him that he has a nice butt. Robin insults Blackfire, commenting that he doesn't know why Starfire puts up with her. Robin suddenly realizes that Starfire isn't with her, and begins to panic. Robin calls the other Titans, and they begin digging up the yard, to see if Blackfire  buried her sister somewhere. Blackfire tells him that she is fine, but she will be serving out the rest of her sentence in her place. The Titans begin to lecture Blackfire about being a horrible person, except for Beast Boy, who quickly calls dibs on Starfire's room. Robin asks Blackfire how she could do something like that to Starfire. Blackfire sarcastically explains that she was never taught how to be a good sister, so they should cut her some slack.

Cyborg excitedly announces that he and the other Titans will train her to become a better sister. Cyborg's lesson #1 involves listening to Beast Boy with both eye contact and hand-holding. Cyborg does an example for her, and then tells Blackfire to try. Beast Boy tells her that he sometimes thinks that he will never find love, but she screams at him to shut up and be a man, which makes Beast Boy begin to cry and run away, then he crashes into something, and the other Titans are disappointed with Blackfire's effort.

Meanwhile, in the space prison, Starfire is filled with hatred toward her sister. Because Blackfire broke her heart, she decides she will break Blackfire. Starfire rips the sleeves off her prison suit and puts a tattoo on her arm, with Blackfire's name in a circle, and a line crossing it out. Starfire begins to practice pull-ups, to get in shape for her revenge.

Back at the Tower, the Titans begin lesson #2: hugging. Robin gives Cyborg a hug as a demonstration, then tells the Titans to hug Blackfire. Beast Boy tries to hug Blackfire, but she punches him in the face. Cyborg tries to hug Blackfire, but gets punched in the face. Raven gives up, and doesn't even try to hug her. Robin explains how to do it, and uses her as a demonstration. Because of her crush on him, Blackfire squeezes Robin in a hug. Robin begins to freak out and tells her she is doing the wrong kind of hug.

Back at the space prison, Starfire gets a knife with a laser on it. Starfire begins to shave her head, then continues to work out.

Back at the tower, they begin Lesson #3: Roleplay. Each of the Titans dresses up as Starfire, so Blackfire can practice talking to her. Things go awry when she insults Beast Boy, makes Cyborg mad, and Raven decides to give up. Blackfire tells Robin his butt is even cuter while he's wearing that skirt. Robin becomes furious and explains that he has no idea how Starfire can still love her after all she puts her through. Blackfire never realized that Starfire really loved her, and she suddenly begins to feel bad for everything she did to her sister. She has a flashback of when they were little kids, and when she stole Starfire's favorite doll, where Starfire appeared sad at first, but shrugged and hugged her sister. Blackfire tells the other Titans that she wants to be a better sister, and begins to take their lessons seriously.

It appears to be too late, however, because back in the prison, Starfire now has large muscular arms, and has been plotting her sister's downfall for a while now. Starfire finally feels like she is strong enough to damage her sister and breaks out of the prison. She speeds toward earth, with nothing but revenge in mind.

Back at the tower, the new kind and friendly Blackfire gives Raven a makeover. Beast Boy asks her if she can give him one, but she replies with "I hear someone who's not happy with himself. But he should be, because he's great." Raven comments that she wishes Blackfire was her sister, because she truly has changed for the better. The Titans are convinced that Starfire will be so proud of her. Suddenly, Starfire bursts through the window. The Titans are excited for her return, but she punches Robin in the face and floats toward Blackfire. Robin reminds Blackfire to use the lessons they taught her. Blackfire apologizes for everything she did, but Starfire tackles her. The two end up fly out of the Tower, into the city, and through over a dozen skyscrapers.

The weak and injured Blackfire attempts to be friendly again, but gets eye-blasted in the face. Blackfire reaches into her pocket and pulls out Starfire's doll that she stole when they were kids. Starfire stops attacking and grabs the toy. She realizes that her sister truly has changed. Starfire looks at her sister, and says that she has changed too. She destroys the toy and seriously damages her sister.

Later at the Tower, Starfire throws Blackfire's unconscious body through the door, and floats in. She happily announces to the other Titans that they have worked things out.

Characters

 * Starfire
 * Robin
 * Cyborg
 * Raven
 * Beast Boy
 * Blackfire (debut)

Trivia

 * The story is similar to the original series episode, "Sisters." In that episode, Blackfire sets Starfire up to be sent to prison in her place, similar to this episode's story.
 * In "Sisters", though, Blackfire wore Starfire's clothes, not vice versa as seen here.
 * The dancing Titans during the theme song have slightly changed. This might be because of the new season.
 * The three aliens inside the prison resemble a Xenomorph, a Predator, and Godzilla.
 * This episode marks the first time when Starfire's hair is changed (dyed purple and cut off) and she doesn't care.
 * This is also the fourth time that is was cut off.
 * This episode marks the first time when a glimpse of Starfire's early life is seen. The other Titans' early lives were seen in both "Dog Hand" and "Dude Relax".
 * This is the second time Robin has worn Starfire's suit. The first was in "Laundry Day".
 * Like in the original series, Blackfire develops a crush on Robin. However, unlike the previous series, this appears to be more legitimate and apart from trying to make Starfire jealous.
 * The cuffs worn on Blackfire when fighting the security robots are the same cuffs worn by Jinx in prison.
 * Robin comments to Starfire how her sister tries to crush her life every time she reenters it despite her seemingly-innocent introductions, which happens to be the exact case from the original series and its corresponding comic series.
 * In the original series, Blackfire showed to be slightly stronger and faster than her sibling; whereas in this series the case is quite the opposite in which Starfire is far stronger and faster. This may be because of her righteous fury toward Blackfire's betrayal and keeping to her own warning should it ever happen again.
 * Blackfire's starbolts (or blackbolts, as properly described) and eyebeams are the same shade of purple as when Starfire possessed when she became Robin's archnemesis in "Starfire the Terrible".
 * This is the third time where Starfire throws her rage.
 * This is the third time that the planet Tamaran is shown, the first time being in "Parasite" and the second time being in "Staring at the Future".
 * When Tamaran is shown in this episode, the same building that was seen for royalty in Staring at the Future is seen in a flashback as the building in which Blackfire and Starfire grew up in. This can help explain why Starfire was given a royal title as queen in an alternate future.
 * The music playing when Starfire is plotting revenge in prison is a reference to Sideshow Bob plotting Bart's death in The Simpsons.
 * This was the first episode when Starfire has barely any hair, but the third losing her hair.
 * This was the first time she willingly cut it all off.