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Villain Overview

Fern is major antagonist in the Cartoon Network series Adventure Time, serving as a major character in Season 8, the main antagonist of the Season 9 finale "Three Buckets" and the secondary antagonist of Season 10. He is an alternate timeline version of Finn that turned into the Finn sword and was eventually merged with the Grass Demon from the Grass sword.

He was voiced by Hayden Ezzy.

Biography

Fern first appeared at the end of "Preboot", when Finn's Finn Sword combined with his Grass Sword and created Fern.

He then appeared in "Two Swords", where he thought he was Finn and attacked him to defend Susan (who said "ouch" right when Finn touched her). When Jake told Fern he wasn't Finn he got confused and ran off. Fern then went to the Tree House where he started to remember how he came into existence. During Finn's fight with bandit princess both swords clashed into each other causing a piece of the Grass Sword to make its way inside the Finn Sword. From the pieces of grass inside the Finn Sword the Grass Demon appeared, which is actually the curse of the Grass Sword who cocooned the Finn in the Finn Sword, telling Finn to let him do the talking when they get out. Fern then started breaking things and scaring BMO. Jake and Finn then confronted him and the former started running around the house with Fern because he wouldn't look at Jake when he was mad. Finn then stopped the commotion by offering Fern a Finn cake. At the end, Fern is seen sleeping on the roof of the treehouse with his hand, imitating the grass sword curse.

He then appeared in "Do No Harm", where Jake tried to help him find his place. This led them to the lair of the Grassy Wizard who created the grass sword. Fern asks him for answers about his existence but the wizard just says he created the grass sword as a joke to the phrase "Blade of Grass." Fern then beats up the wizard and takes him to the Candy Kingdom hospital. Fern then steals starchy's bike then rides off into the sunset with his hair flowing in the wind.

Fern then appeared at the first episode of the "Islands" miniseries, being "The Invitation", where Finn meets him up on the tree house roof and entrusts the safety of Ooo to Fern. Fern then goes to the beach to see Finn set off and waves goodbye. Fern then appears in a flashback in "Light Cloud."

In the first episode of the "Elements" miniseries, "Skyhooks" he has been transformed into Fun by the candy elemental powers causing Fern to become so happy that he doesn't have any problems about himself. Fern is then transformed back into his true self in "Skyhooks II" by Lumpy Space Princess.

In "Whispers", Fern tries to help save Sweet P from the Lich's hand but fails. At the end he becomes more jealous of Finn and decides he should be the only Finn as he slowly transforms into him.

In "Three Buckets", Fern traps Finn in a Stone Temple and tries to take his place. Finn then gets out with his robot arm and fights off Fern. Fern then gets taken control of by the curse. Fern is then killed by Finn with his remains spread all around him. Fern's remains are then picked up by Uncle Gumbald.

Fern then appears in Gumbald's lab in a new form in the episode "The Wild Hunt". Fern then makes his reappearance in "Seventeen" as the Green Knight. He competes with Finn in some birthday activities then he defeats Finn in an arm-wrestling match. He was about to kill Finn but was stopped by Gumbald. After a recap of things and an attack attempt by Gumbald, Fern leaves with Bubblegum's relatives promising to be back.

In "Gumbaldia", Fern fights off Finn but gets stopped by Aunt Lolly. In the end he is part of the group of villains that Uncle Gumbald has gathered to go to war with the Candy Kingdom and Princess Bubblegum.

Fern makes his final appearance in "Come Along With Me". He is ready to fight in the gum war but gets trapped in a dream with Finn and his friends. After Gumbald betrays him Fern starts to attack and destroy things to feel better. Finn tries to calm Fern down but Fern is determined to fight him. They both come face to face with the vault demons that Jake released and go inside it to kill the Grass Demon who was tormenting Fern. When Finn steps inside the vault he sees Fern as himself with the Grass Demon strapped to him. Finn then manages to remove the curse, but before Fern kills it, the Grass Demon tells Finn that without him, Fern has no body. Fern kills it, freeing himself from it's control. Now fully redeemed, Fern aids to fight off GOLB, but without the grass curse, Fern slowly deteriorates. Eventually, Fern dies and leaves behind a tiny seed shaped like the Finn Sword. Finn then plants the seed and it grows into a tree with a new Finn Sword in it.

Trivia

  • Fern is fittingly named after a plant, with a fern being a member of a species of vascular plants that reproduce through spores and don't produce flowers or seeds.
    • Despite his naming scheme, Fern is able to grow flowers, with him growing a flower in his nose when he smelled a Finn Cake.
  • Strangely, Fern is unable to breathe (and can't play the flute) despite being able to talk.
  • In the episode "Three Buckets", Fern wanted to be the only Finn and take over his life, which is a reference to a Star Trek episode "The Enemy Within".

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