Finn, Jake and Marceline are trapped in an underground cavern with no red in sight. If Marceline doesn't feed, like ASAP, she will turn into a vampiric beast and suck out all of Jake's blood! So, Finn heads off to explore the cave and find something red to satiate her until they can be rescued. But time is running out!
Finn practices his sword fighting skills at the candy junkyard, where he meets an old gumball robot named Rattleballs. To Finn's shock, he finds out he's not the master swordsman he thinks he is. What the what?! Finn begs Rattleballs to train him, but he soon discovers his mentor's deep, dark secret... a secret that will ultimately test Finn's loyalty to Princess Bubblegum.
On a field trip to the Candy Kingdom Museum of Natural History, Finn and Jake learn about the food chain by becoming the food chain!
Shelby is thrust into a new role after a party-related accident.
Fed up with Jake's antics, his son Kim Kil Whan takes action.
It's Princess Day in Ooo! You know what that means? Yep, LSP and Marceline team up to prank Breakfast Princess!
Finn and Jake contend with a mysterious, but familiar, new being.
Finn makes amends at the Candy Hospital while Jake tries to connect with their unexpected houseguest.
Kim Kil Whan is worried about his daughter's future and asks Jake for some parental advice.
An otherworldly encounter puts Tree Trunks on the trail of a conspiracy in the Candy Kingdom.
When disaster befalls James Baxter, it's up to Finn and Jake to help him pick up the pieces.
Princess Bubblegum's scientific mind must wrestle with her Elemental magic potential when she's faced with a Crystal Entity.