Daddy's Little Monster

"Daddy's Little Monster" is the sixth episode in season four of Adventure Time.

Synopsis
Finn and Jake attempt to rescue Marceline and find out what's making her behave so strangely. Part 2 of two-part episode.

Plot
The episode begins where part 1 leaves off with Beemo charging Jake's phone. The phone is finally charged and Finn and Jake watch the video of them in the Nightosphere. There are 3 videos, the first video shows Finn and Jake going into the Nightosphere to hang out with Marceline, then the next video loads they are playing music when suddenly Marceline's dad comes in and tells Marceline he wants her to take over the Family business and rule the Nightosphere with his evil amulet that can grant your most evil wishes. Marceline refuses, claiming she has her own plans for life, but she does put it on to try it out and accidentally turns herself into an evil monster. Then the video blacks out and a third video comes on explaining how Finn and Jake got thrown in their Jail cell by The Nightosphere jailer.

They decide to return to the Nightosphere to save Marceline, then, after disguising themselves, Jake and Finn go back using the spell that Marceline used to summon her father. When they go into the Nightosphere, they find themselves trapped in yet another line, but this one to see Marceline, who is playing cruel tricks on the demons of the Nightosphere. They are discovered by Marceline when they try to cut the line, and they barely escape after Marceline tries to eat them. They run into a house and find the Lord of Evil making a sandwich. He explains to them that he only wanted Marceline to follow his footsteps and that he thinks it is great she has been possessed by the amulet. Finn gets angry, slaps The Lord of Evil's sandwich out of his hand and go back to rescue Marceline.

Finn and Jake decide they need a way to get close to Marceline and start a political rap. Soon, other demons join them in the revolution to help them. They reach Marceline and finally get to take off the amulet that was controlling her. However, Jake isn't able to go back to the portal they created before as the demons don't let him move. So Finn puts on the amulet and pushes Jake and Marceline out of the Nightosphere. Unfortunately, under the control of the amulet, he tries to get Jake and Marceline back to the Nightosphere as he has become evil, but the Lord of Evil rips the amulet off of Finn and puts it back on and explains to Marceline that he is proud of her no matter what she does, and that he likes her friends and the Nightosphere closes. Marceline then says she won't hang out with Finn or Jake anymore. The episode ends as Finn is shivering after having been under the control of the amulet, ignoring what Marceline is saying.

Main Characters

 * Finn
 * Jake
 * Marceline
 * Lord of Evil

Minor Characters

 * Beemo
 * Demons
 * Snail

Music

 * Little Girl
 * Demon Apathy

Trivia

 * This is the second time Finn loses his humanity. The first was in Trouble in Lumpy Space.
 * This is the second time Finn loses his "purity" the first being in "City of Thieves."
 * Since Marceline's dad is deathless, it is unknown why he would need a heir.