A sunset comes occurring at the Candy Kingdom as Marceline and Princess Bubblegum have decided to go to Alex's castle to get answers. The clothes they're wearing at this point are the ones from the first time they attended movie club; the former wears an open plaid, button-up shirt with a black T-shirt underneath, blue pants, sneakers, and a gray cap with a picture of a horse breathing fire while the latter wears a pink hoodie, light purple pants, and pink shoes. They left the castle with Marceline wearing a hood so that the Candy People can't throw her with more of those rotten tomatoes. Outside, she takes the hood off.

As they walk to the sunset, the princess noticed the vampire is holding a black umbrella at her right hand.

"Why are you carrying an umbrella even though it's a sunset?"

"Because you'll never know if there are more people who are gonna throw me with more of those rotten tomatoes just because I'm being accused of something I didn't do."

"Is that so?" asked Princess Bubblegum with curiosity on her face.

"Yes. You know, you'd think at some point they'd run out of those things to pelt me with!" The look on Marceline's face went surprised as she saw more rotten tomatoes are going to be thrown to her. Therefore, she opened her umbrella to defend herself. Princess Bubblegum looks at the people throwing the tomatoes; it's Muscle Princess, Engagement Ring Princess, Emerald Princess, Slime Princess, and Wildberry Princess. "Why is it that people have a tendency to throw tomatoes at anyone they're displeased at?"

"That's their usual M.O. You make a good performance, they'll praise you; you make a bad performance, they'll throw you with tomatoes."

"Tell me, Bonnibel, where are those tomatoes coming from?" the Vampire Queen is still defending herself from being hit with the tomatoes.

As the princess looked at where it is coming from, she saw the answer. It's from a tree of rotten tomatoes. "Here's your answer, Marceline."

As soon as the princesses stopped throwing rotten tomatoes at Marceline, she and Bonnibel continue to head on to the castle.

"You know, I like sucking the color red out of things like tomatoes, but throwing me with something like that is very outrageous!"

"Well, I agree with you on this one."

Nightfall enters the Land of Ooo as they find themselves near the front entrance of Alex's castle. They looked at to see it guarded with lots of robots carrying spears guarding it.

"Wow," Marceline looks surprised in seeing such guarded place. "Alex really knows how to create these much robots to guard it. How are we gonna get past that?"

"Well, I got a diversion to distract them," Princess Bubblegum uses a noisemaker to activate some noise. This distracts the robots as they left the castle to find out who's cause it. While they're doing so, the two girls sneak up behind them as they open the door and close it quietly. Inside the castle, it looks quiet.

"Either Alex is asleep or not here," the vampire acts puzzled by her statement and remarks as she and the princess looked at the trophies and the weapons. "So, where do we start looking, Bonnibel?"

"If I know Alex, it's her office," was her reply.

The two proceed to Alex's office. Inside, they begin to look from the bookshelf and desk to search for their answers regarding her. So far, they found nothing.

"We found nothing in here," Marceline said after searching from the folders.

"Well, at least we know how Alex hates you so much, Marceline," Princess Bubblegum takes a look at the dartboard with a picture of her getting hit with darts. "If I know Alex is a genius, she must have a laboratory."

They take a walk through the hallways until they find a door that says "laboratory". Then, they walk through a staircase below to see it. As they're amazed to see the place, they find a whiteboard stating the plans for creating dark swamps.

"These notes indicate to create a formula to turn the Land of Ooo into a dark place," the princess takes a look at it in seconds before realizing the answer. "That's it, Marceline. Alex has been causing the dark swamps to make you look bad so she can win the election."

"Now that I know it's her who's making me look bad, I'll give her a total beatdown!" the vampire is enraged when she finally finds out the truth.

PB takes a look at the notes carefully and write it down. "We must show this to Finn and Jake that Alex did this. That will convince them you didn't do this."

"Oh, you two really want to do that, huh?" Alex appears from the staircase with an emotionless look on her face before making an evil smile on her face.

"Why are you doing this, Alex?" Princess Bubblegum asks the nerdy human girl in anger for what she has done.

"Like I said, Bonnibel, to win the election. In fact, I have plans on making Marceline pay for hurting every soul in the Land of Ooo, including you," Alex walks down from the staircase to face the two girls. She then lifts her right hand as she removes her glasses. "If you two want a fight, then you got it right here."

She tosses her glasses in the air as Marceline catches it. However, Alex makes different punches on her face and stomach before getting her glasses back and kicking her in the air. As she faces Bonnibel, she grabs her wrist and punches her head and face, sending her to a wall. Once that's done, Alex puts her glasses back on her nose. To her, it's quite satisfying. Marceline charges to tackle her, but it didn't work as Alex grabs her by her hair and hits her with her knee, and hits her in the back with her elbow. Then, she tosses her to the floor.

"You know, I didn't do this alone."

The Vampire Queen noticed that someone is pointing a raygun at her head. It's Ash.

"Hello again, Mar-Mar, it's nice to see you again," said the immortal wizard with an unusual smile on his face.

"It makes sense when you're siding with some 'mere mortal'," Marceline said in sarcasm.

Just then, Magic Man, Door Lord, and Witch all appear in the lab. The big yellow creature grabs PB with his two hands.

"Now you know the truth," Alex said with a smug look on her face.

"So, you hired those two to ruin my campaign," Marceline pointed it out to Magic Man and Door Lord.

"That's right," the nerd replied back. "You know, when it comes to the Door Lord, I'm more than a witness in the day you two worked together in getting your stuff back from him."

That statement made PB realize the truth. "You planned this scheme in that day, didn't you?"

Alex then faces her to say, "That's right, Bonnibel, and I win."

"But that's impossible," Marceline tries to defend that statement. "Look, even though Bonnie and I got into an emotional argument and left without our things, we managed to work together in getting it back, thanks to Finn."

"Yeah, but you didn't even realize there's a backup plan in that, so I'll explain it to you two," Alex pulls out a marker and went to the whiteboard to make a diagram. "You see, I hired the Door Lord to bring you together so that you can make arguments out of yourselves. You two leave without your things, I win; you work together to get your things back, but didn't imprison the Door Lord, I win; you win together and imprison the Door Lord, but didn't stopped the real mastermind which is me, I win. Therefore, no matter what you do for this scheme, I win."

"So, am I supposed to say that Ash getting the memory of our breakup was part of your plan?"

"That's right, Marceline. Oh, that reminds me."

Alex walks up to a drawer to show the Vampire Queen an object that she happens to be familiar with. It's a broken, torn, and dirty teddy bear. Marceline begins to show tears because she knows it; it's Hambo, her precious teddy bear.

"It's Hambo!" the vampire said in sadness, but is also happy to get a reunion like this.

"You want him? Then, get him," the nerdy girl throws it to her as she begins to hug it, having a reunion she wanted to have for so long. As the others watched it, PB also cries in happiness for such event. "Too bad your reunion is short-lived," Alex grabs the teddy bear from Marceline's hands as she tears it in front of her. To her, it's quite amusing.

Seeing this really enraged Marceline as her eyes turned red and begins to transform into her wolf form. "So you enjoy hurting me, huh? Well, you made of doing that!" she charges at her opponent with her claws.

"Oh, did I?" Alex dodges her blows with her speed. She's just too fast for the Vampire Queen to hit her; as she attempts to slash her with her right claw, Alex just grabs her wrist and takes out her laser pistol from her coat by her right hand to shoot her numerous times in the chest. She heals from this and tries another attack, but the nerdy human gets a remote control with one big red button. As she presses it, the big light is activated as it weakened Marceline. It turns out Alex created an experiment to damage her with sunlight. Weakened, she turns back to her normal form. "What's the matter, Marceline? Not having a good day?"

Enraged of seeing her friend taking such beating from her opponent, Bonnibel frees herself from the Door Lord by kicking him in the crotch. She runs to her to give defense.

"You sadistic monster! How could you hurt her so much like that!"

"You two should know by now that I've been watching your every move," the nerdy human said with a smug-like smile on her face. "That's right, we've been watching everything you two do in your life. For instance, the movie night and the 'genuine band' events are quite the examples. If you want to know how did I see it, I went there by myself. As for your surveillance, it's a spy camera disguised as a housefly. See? It's there to watch you two at this moment. Quite remarkable, don't you agree?"

The princess is angered of find out such act that she takes out a weapon from her her hoodie: a raygun. She blasts it on the camera and hits the big light, saving the vampire's light as she's healed.

Alex laughs. "Very nice, Bonnibel. I didn't know you had it in you, but I already got enough data anyway. Oh, Finn and Jake are also being watched. Their adventures are part of my plan all along. In fact, they didn't even know their adventures are really training programs to teach them in fighting you, Marceline, in case you 'gone rogue'. In other words, they'll think you're the bad guy while they think of me as a hero."

"You've been planning everything all along, didn't you?" the Vampire Queen asks in curiosity.

"That's right, Marceline. I think it's about time you and Bonnibel should know something about me," the human girl pointing her laser pistol to them.

"What's that?"

"The term is 'falling out', but I know how to make that simple for you two."

As this line went into their ears, Marceline and Bonnibel have finally discovered the truth of their falling out. In fact, they're facing the truth at this moment.

"It was you all this time!" the former said in anger.

"You're the reason our relationship is broken!" the latter yells it out in anger.

"Now you know the truth," Alex said calmly.

"Why are you doing all this?" Marceline finally understands why she and Bonnibel have problems with their relationship.

"Why? I'll tell you in a form of this song."

She started sing this song.

"Sorry I don't treat you like a goddess,

Is that what you want me to do?"

Both the princess and vampire are shocked upon hearing those words. In fact, they know those words.

"Sorry I don't treat you like you're perfect,

Like all your little loyal subjects do,

Sorry I'm not made of sugar,

Am I not sweet enough for you?

Is that why you always avoid me?

That must be such an inconvenience to you well,

I'm just your problem,

I'm just your problem,

It's like I'm not, even a person, am I?

I'm just your problem"

Alex stopped singing to see the two have shocked look their faces. "You two know those words, huh? That's right, Bonnibel, it's the same song Marceline mocked you with. The irony is that she gets mocked by her own song," she pulls out a portrait of herself as a kid with a young PB. "You know, Marceline, Bonnibel and I are two inseparable people. We used to do everything together. We hug, cry, play, and work together. You know, I'm beginning to see her as more than a friend; a lover, that is. We spent years doing this until you showed up in our lives. As time goes, she begins spend more time with you and less time with me. I tried to be happy, but I just can't. In fact, Bonnibel, you didn't spend your time with me anymore; it's as if I didn't exist in your life anymore. This is why I hate you so much, Marceline. For taking away my precious only ever away from me. So I planned your falling out, and waited for the right time to kill you so that can have Bonnibel all to myself. In that age you're in now, that's the right time."

"You did all that just to get her back to you?" Marceline can't believe what her opponent just said. At least now she understands the reason Alex hates her so much. "Alex, you have gone insane."

"You want to beat me, huh, Marcy? Too bad you can't. Unlike you and Bonnie, I don't have emotions. My hatred for you, that's what makes me stronger," the nerdy human girl then pointed her laser pistol into the vampire's head. "Time to die, Marceline," as soon as she's about to pull the trigger to end her life, the latter grabs the former's hand and punches her in the face, throwing her to the side of her table. "Get them!"

Ash and Door Lord will get Marceline while Magic Man and Witch will get Bonnibel. The wizard and witch combine their energy beam attacks to hit the Vampire Queen, but she blocks it with the use of her axe bass. She makes an attack on Witch as she kicks her to send her falling. As she faces her ex-boyfriend, he forms a magic sword on his right hand and attempts to strike her, but she blocks the blow in time.

"Face it, Mar-Mar, Alex is too powerful for you to beat. You can't stop her," Ash said it boastfully.

"Oh yeah? I'll try to do that, Ash," Marceline continues to block his blows until she makes a kick to his stomach, sending him flying to a wall.

Meanwhile, PB faces Magic Man and Door Lord. She kicks the latter to send him flying to a wall, and knocking him out.

"So, what am I going to do you?" the former wonders. "Oh, I know! Zap you!"

He launches an energy beam attack, but the princess uses her raygun to counteract it. It's a tug of war like battle as their beams begin to struggle for control.

"Your beam is strong, Magic Man, but mine is more stronger than you!" she increases the level of her device that it hit the Magic Man. Then she focuses on Marceline. "We've got to get out of here."

"So, you'd rather go with her than me, huh?" Alex gets up still point the gun from her right hand. "If that's case, then I'll kill you, too, Bonnibel. I caused your falling out, and the way for me to end it is for you two to die together."

"You know what, Alex? You've gone crazy."

She shoots with her weapon to the two girls, but Marceline blocks it with her bass. Luckily, Princess Bubblegum dodges her blows as well. It seems they're an equal. However, the two left the castle. Alex laughs evilly and said, "Fine, run away. If can't kill you right now, Marceline, then I'll just kill you when I get your position."

Inside the castle at the Candy Kingdom, they're in the princess' room to discuss about what happened.

"If only I knew early on that Alex is responsible for our breakup, we could have gotten along well right now, even in Finn and Jake's presence," Princess Bubblegum looks depressed as she sat on her bed. "How could I've been so stupid?"

Marceline puts her hand to her girlfriend's shoulder as a sign to comfort her from this. "Hey, Alex used me to hurt you so that you can go back to her."

"Now that I know the truth, I wanted to say I'm really sorry for avoiding you," the princess said with remorse in herself.

"And I wanted to say I'm really sorry for hurting you," the vampire said with remorse as well.

"So, friends?"

"Friends."

The two hug each other in happiness.

"We're more than friends," Marceline said.

"What's that?" Princess Bubblegum asks in wonder.

"Lovers."

The Vampire Queen takes a kiss to the princess' lips. For them, it is the sign of reconciliation; a sign of rebuilding their relationship.

"I love you, Marceline."

"I love you, too, Bonnibel."

The two started to make a few kisses before they drifted to sleep together in the princess' bed.