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Once finished, Marceline shares one final scolding look on Princess Bubblegum before turning her back. Heartbroken, Marceline sings an angry scathing break-up song to Bubblegum, which somehow worked on the dragon, and managed to drive the dragon back into the Furnace. But after a heated argument between Marceline and Princess Bubblegum, PB unintentionally lashes out at Marceline, and tells her to go home. Princess Bubblegum was called in to figure out a way to defeat the dragon, with Marceline, Bubblegum's girlfriend at the time, tagging along with her. But then, a powerful fire-breathing dragon emerged from deep within the ancient furnace, and it caused destruction in the kingdom by melting everything in sight. They even discovered the "Furnace", which is a cave at the top of a mountain where the glass people can go to to get their cracks fixed. And for centuries, the glass people have lived there peacefully. The flashback quickly shifts to hundreds of years later, becoming the place where the Glass Kingdom, inhabited by the Glass People, now stands.īack then, the desert was nothing but a wasteland, until it was struck by bolt of magic lightning, thus creating the Glass Kingdom. In a quick flashback, Elise and a young Marceline are walking alone in the desert, heading somewhere. Marceline and Princess Bubblegum journey to the imposing, beautiful Glass Kingdom, and deep into their tumultuous past, to prevent an earthshaking catastrophe.
