Fionna and Marshall Lee were walking around Aaa, pulling pranks and causing mischief. They fell to the ground laughing until Fionna eyes a pair of feet belonging to Prince Gumball. Scrambling to her feet quickly, she says hello to the prince and asks him what was he doing here. He replies to our heroine that he was taking a stroll around and asks her if she'd care to join him. She quickly agrees but remembers that Marshall was standing right there, so she declines sadly. Gumball tries to persuade her to come with him. Marshall chuckles under his breath and mumbles, "Poser."
Gumball walks up to the bad boy vampire and says, "I've heard that, dear Marshall. Don't be jealous. It's bad for your health."
"I'm already dead, dunce!"
"Exactly. Your death was caused by jealousy. Excuse me, Marshall, as me and Fionna have things to discuss...mature people things...right, Fi?"
"Uh. I-uh...um. Sure, G-gumball."
"What?! Fionna, you're not gonna leave me for this bozo, are ya?!"
"Calm down, Marshall."
"No way!"
Fionna pulls Marshall to the side as she tries to calm him down and talk to him reasonably.
"Marshall, I'm going to be a minute, okay?"
"No. He's a crooked dude. He's...not himself. Fionna, if you love me, you'd stay away from him."
"Oh my grapes, you're acting like Cake!"
"Someone has to. I know you're independent. But...trust me."
"Should I really trust you...? You're a deceiver, Marshall."
"You're in love with a deceiver."
"I hate you, Marshall Lee!"
"The same goes for me too."
Fionna's eyes were swelling up with tears. She tries to wipe them off herself, but Marshall beat her to it. She pushes his hands away from her face and leaves with Prince Gumball. Gumball wraps his arm around Fionna's neck as they walk off together but she didn't bother to notice Gumball turning his head and smirking at Marshall Lee. Marshall Lee growls and reveals his fangs but slowly tries to calm down. He wasn't going to let some pretty boy stuck-up snotty rich kid play him like that. He wanted to tell Cake what happened, but he remembered Fionna telling him their big fight. Cake might be still upset at Fionna for how she treated her. And Fionna might still be upset at Cake for kicking her out. But they're sisters. They were going to have to make up at some point.
