1x8 - Adventure Time - Mini Series “Stakes!”

The Dark Cloud moves towards the Candy Kingdom, pursued by Finn, Jake, and Bubblegum. Seeing Bubblegum fighting the Dark Cloud, the people of Candy Kingdom are inspired to overthrow the King of Ooo and join the battle. Marceline resigns herself to defeat until the Ice King instills in her a sense of purpose, convincing her it is her destiny to stop the Dark Cloud. Marceline eventually uses her demonic soul-sucking abilities to drain the Dark Cloud from the inside out. However, in doing so she once more becomes the Vampire Queen. In the aftermath, Marceline comes to terms with her vampiric nature, telling Bubblegum that her time as a mortal has made her more mature. Marceline sings a rendition of "Everything Stays", with short sequences of Ooo's return to normalcy.