Crystals Have Power

"Crystals Have Power" is the eighth episode of season two of Adventure Time.

Synopsis
Jake takes a vow of non-violence, which is inconvenient when marauders from the Crystal Dimension kidnap Finn for their great master.

Plot
Finn is examining a crystal with a kiss mark on it that was left at the door of the Tree Fort while Jake challenges him to a "tough guy contest". Finn suggests that the crystal was from Tree Trunks, but Jake believes that Tree Trunks is gone. She previously ate the Crystal Gem Apple in the episode Tree Trunks, then disappeared. Finn stops his studying of the crystal and then begins to have a tough guy contest with Jake. Jake accidentally harms Finn when he loses control, so when Finn goes to bed to rest his damaged muscles, Jake has a flashback. In it, he and his brother Jermaine are seen with boxing gloves, but Jermaine is seen knocked out on the floor. Jake's dad asks Jake what happened, and Jake replies that he was just playing around and he lost control. His dad then says that it is okay to hurt anyone, but Jake vehemently disagrees. After the flashback, Jake takes a vow of non-violence, and refuses to harm anyone by means of physical force. The next day, the crystal opens a magic portal to the Crystal Dimension, and three Crystal Guardians appear. They ask for Finn, and when Finn gives his name, they forcibly take him through the portal with Jake running in shortly after.

In the Crystal Dimension, Jake finds Finn trapped in a crystal bubble. Two guardians are seen holding a sort of crystal weapon, while the other one is guarding the entrance to the cave where Finn and the other two are. Jake tries many different methods to get past the guardian, as he is living up to his non-violence vow, but all are unsuccessful.

As time passes, the two guardians are seen to be turning Finn into a crystal. After Finn becomes fully crystallized, the guardians allow Jake to pass, saying that there is nothing that he can do now. Jake laments and says to Finn that he was sorry for not being able to help, when the crystallized Tree Trunks appears. The Crystal Men begin to bow down to her, but she vaporizes them. It is then that Tree Trunks' plan is revealed: after she ate the Crystal Gem Apple, she became Quartzion the Crystal Queen and was teleported to the Crystal Dimension. The three Crystal Men were all in love with her, but Tree Trunks only loved one person: Finn. She wanted to make him her Crystal King.

Jake still refuses to fight Tree Trunks, and she picks him up with her trunk and throws him hard onto a piece of crystal. It is then that he has a vision. His dad and Jermaine appear, and Jermaine says that it was fine that Jake hit him. Jermaine also said that he's not dead, he's having the same vision as Jake. His dad then says that Jake did not listen to his full speech: Joshua said that it was okay to harm anyone bad. Having heard this, Jake kicks Tree Trunks in the stomach, causing her to spit out the Crystal Gem Apple, which was the source of her power. Tree Trunks then returns to normal, she apologizes to Finn, saying that she thought that he was cute and nice. Finn accepts her apology, and Tree Trunks says when they get home, it's apple pie time. The crystal apple that Tree Trunks spit out turns into a portal back home and they all go in. They are then seen floating and holding hands through the portal while auto-tune singing is heard saying: ♪ apple pie in the oven; tell me you can taste lovin' ♪...

Major Characters

 * Finn
 * Jake
 * Tree Trunks
 * Crystal Guardians
 * Joshua

Minor Characters

 * Jermaine
 * Snail

Music

 * Apple Pie

Trivia

 * It is revealed in this episode that that Jake has a brother named Jermaine.
 * This is the first episode that Jermaine is shown.
 * Joshua is confirmed to be dead, which had previously been stated by Frederator Studios.
 * The last scene of the episode "Tree Trunks" is believed to be a preview of this episode.
 * When Jake said "If I had a penny for every time someone hooped up on magic... I'd be Abraham Lincoln!" that is both a reference to the animated short and the climax of the previous episode.
 * In the episode "Tree Trunks", Tree Trunks takes a bite of the Crystal Apple, but in Jake's and Tree Trunks' flashbacks she eats it in one bite.
 * This is the last episode to come out in 2010.
 * This is the first episode to look back at an event in a previous episode.
 * This is part of a saga about Tree Trunks. There seems to be one episode about her per season.
 * This is the second episode where Tree Trunks is a main character.
 * The title on the title card bears a similarity to the logo design on the 1980's Marvel Comics title "The Saga of Crystar: Crystal Warrior."