Ep 24. This Mortal Folly

Finn and Jake set out on an adventure to the beautiful island of Boom Boom Mountain. They are excited to climb the mountain and explore the wonderful world that awaits them. However, they soon discover that evil is lurking on the island. The Ice King, who is always up to no good, has traveled to Boom Boom Mountain with his loyal penguin minions. He plans to use a powerful item he found on the island to capture Princess Bubblegum and force her to marry him.

Finn and Jake quickly realize they must team up with Princess Bubblegum to stop the Ice King's plans. Together, they formulate a plan to infiltrate Ice King's castle, where he is keeping Princess Bubblegum prisoner, and steal the powerful item. But they will have to be quick, as the Ice King's minions are on high alert and will stop at nothing to protect their master.

As Finn, Jake, and Princess Bubblegum make their way through the castle, they face many challenges and obstacles. They must navigate through intricately designed mazes and outsmart guards that are patrolling every corridor. Even with their combined powers, the trio may still be overwhelmed by the Ice King's army.

Eventually, Finn and Jake manage to get ahold of the powerful item, but are quickly pursued by the Ice King himself. They flee through the castle, chased by the powerful magic the Ice King is wielding. The chase ends in a final showdown between the Ice King and Finn, with the fate of the entire kingdom hanging in the balance.

In the end, Princess Bubblegum is saved, but not before suffering a grave injury. Finn and Jake rush her back to their home in the Candy Kingdom, where they enlist the help of Lady Rainicorn to heal her. The episode ends with a somber note as Finn realizes that even though he's a hero, he cannot save everyone from harm.