Ep 13. The Great Bird Man

In Adventure Time with Finn and Jake season 5 episode 13, titled "The Great Bird Man," viewers are transported to the Land of Ooo where Finn, Jake, and Princess Bubblegum are on a mission to investigate a mysterious bird-man named Xergiok who has taken over a small village and is causing chaos. As they approach the village, Finn and Jake realize that the bird-man is none other than their old enemy, the former Goblin King.

Xergiok has been banished from his own kingdom and has been wandering the land trying to find a place where he can belong. He stumbles upon the village of innocent birds who welcome him with open wings, but Xergiok becomes power-hungry and decides to take over the village and turn it into his own personal kingdom. Using his Goblin magic, he forces the birds to do his bidding and live under his rule.

Finn and Jake arrive at the village and try to reason with Xergiok, telling him that his actions are wrong and that he should leave the birds alone. Xergiok, however, refuses to listen and orders his army of Goblin birds to attack the trio. Finn and Jake must use their skills and creativity to fight off the Goblin birds and save the village.

As the battle ensues, Princess Bubblegum uncovers a secret about Xergiok's past that explains his obsession with power and control. With this new knowledge, the trio is able to reason with Xergiok and convince him to step down as leader of the village and make amends for his actions.

In the end, Xergiok joins Finn and Jake on their journey, looking to make up for his misdeeds and find a new purpose in life. The trio leaves the village, with the birds thanking them for their help and Xergiok waving goodbye with newfound humility.

Overall, "The Great Bird Man" is a heartwarming and action-packed episode that continues to showcase the depth of character development in Adventure Time. Viewers will enjoy the comedic exchanges between Finn, Jake, and Xergiok, as well as the stunning animation and unique landscapes of the Land of Ooo.