Adventure Time Comic Issue #16

Ice King has kidnapped Lumpy Space Princess and now Finn and Jake are fighting him in his giant Gunter ice mech. They defeat him when he distracts himself by monologing about how clever he is. Ice King doesn't really care though, as Lumpy Space Princess is his least favorite princess. They break Lumpy Space Princess out of her cell and she calls them "true ultimate heroes." This causes a trapdoor to open and Finn, Jake and Ice King fall into a dungeon design to test heroes. Ice King suddenly remembers that he and Hunson Abadeer built it as part of some master plan and that there are prizes at the end.

Ice King tells Finn and Jake they can come with him and they are shocked that he considers himself a hero since he constantly kidnaps princesses. Ice King explains that he "rescues" princesses from the loneliness and boredom of royalty. This causes Finn to consider Ice King's point of view but Jake brings upPrincess Monster Wife and Ice King points out that they made her feel so bad she left forever. This causes Finn and Jake to feel sad but Ice King tells them to forget it and they go to explore the dungeon. After getting flashlights from Finn's backpack, they come across the "Hall of Just Ice" and when they enter it a monster-shaped sculpture Ice King made falls on top of them.

As they travel further into the dungeon, they eventually come across a chamber with three eyebabes, monster eyeballs that shoot ice at their enemies. Jake distracts them and Finn is able to cut them in half. Then it is revealed that he eyebabes were the heralds of a giant Ice Queen. Finn and Jake are shocked that Ice King made a female version of himself and he exclaims he doesn't know and he was going through stuff ith his relationships when he built this dungeon. Ice Queen is happy to see Ice King, but rebuffs him when she remembers he abandoned her. Ice Queen prepares to stomp Finn and Jake but Ice King flys through her chest causing her to break to pieces. This frees an old lady Ice King used to power Ice Queen's "secondary regality processor."

As they continue through the dungeon, Finn points out that Ice King doesn't remember much about the dungeon. Ice King explains that as you get older, you begin to lose precious old memories in order to make room for new ones. This depresses Finn and Jake. Finn ask why doesn't he just write them down and Ice King explains he has rooms full of books that he doesn't understand why he wrote in the first place. 

They eventually come across a patch of clear ice, but don't see any treasure underneath it. As they continue along, the panel expands to reveal that there is treasure under the ice and that it's being guarded by a horrible sea monster.