Attack of the Rattle Bots

Set about two months after the Distant Lands special, Obsidian. After finally coming home from a long and disastrous concert tour, Marceline discovers that Princess Bubblegum has installed a new A.I. security system in the Candy Kingdom. Unfortunately, the upgrade turns out to be a bad idea. To make things worse, a demon suitor shows up asking for Marceline's hand in marriage.