A deadly space emergency in the farthest reaches of the galaxy finds Sheriff BMO and Deputy Y5 rushing against the clock to save the day.
Marceline and Princess Bubblegum must face off against demons from their past in order to defeat a reawakened enemy in the Glass Kingdom.
Finn and Jake are together again, rediscovering their brotherly bond and embarking on a new adventure.
Peppermint Butler starts over as just another inexperienced student at a wizard school filled with dangerous secrets.