You will Watch Adventure Time Season 7 Episode 12 online for free episodes with HQ / high quality. Stream cartoons Adventure Time S07E12 Checkmate (Stakes Part 7). While Marceline and the rest of the group plan how to battle the Vampire King, the Vampire King himself appears before them. The group attempts to attack him, but Vampire King reveals that he has no wish to fight them. He has grown tired of his endless battle against Marceline, and instead seeks a new path by asking Bubblegum to cure him of his vampirism. The group reluctantly agrees to help the Vampire King and takes him to Bubblegum’s lab, where she extracts the Vampire King’s vampiric essence. As a result, the Vampire King reverts to his original form, a lion. Bubblegum then tasks Peppermint Butler with properly disposing the essence to ensure it cannot harm anybody, but he accidentally drops the container and releases the essence, which explodes into a black cloud and begins to form into a giant monster.