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Season 4: April 2012Edit

Season 4 premiered on April 2, 2012.^[51] Episode titles were posted on the Frederator Blog in March 2012.^[52]

Writing of the season started on or before May 2011.^[53] According to Andy Ristaino, by February 2012, the season had been written, storyboarded and approved.^[54] The season will see the premiere of the 100th episode of the series, "The Hard Easy" (previously titled "Prince Huge"). Adam Muto reported that characters not seen since Season 1 will return, with The Earl of Lemongrab, Magic Man, The Lich, Marceline's father and NEPTR being confirmed to return. Adam Muto said that both BMO and Marceline's backstories will be also explored a bit more in this season.^[55] The season will feature guest voices by Donald Faison, George Takei, Erik Estrada, Andy Milonakis, Emo Phillips, Bobcat Goldthwait and Susie Essman.^[51] There will be two-part episodes in this season.Jeremy Shada also mentioned that Marceline and Ice King will sing together.^[56]

Title card	Title	Viewers (in millions)	Prod. code	Airdate
	Hot to the Touch	2.655[57]	082	April 2, 2012
Finn goes on a quest to prove Flame Princess isn’t really evil, but ends up trying to stop Flame Princess from taking over the Goblin Kingdom.
	Five Short Graybles	TBA	079	April 9, 2012
A series of short stories all centered around the five senses.
	Web Weirdos	TBA	081	April 16, 2012
When Finn gets trapped in a giant spider web, he ends up playing marriage counselor to a couple of grumpy arachnids.
	Dream of Love	TBA	080	April 23, 2012
Tree Trunks is courted by an oinking suitor, but much to Jake's dismay, this interferes with her baking habits.
	Return to the Nightosphere		085	April 30, 2012
Marceline’s dad banishes Finn and Jake to the Nightosphere, and it stinks. Literally.
	Daddy's Little Monster		086	April 30, 2012
Finn and Jake attempt to rescue Marceline and find out what's making her behave so strangely.
	In Your Footsteps		083	May 7, 2012
Finn and Jake befriend a bear, but what are the bear's intentions?
	Hug Wolf		084	May 14, 2012
Finn discovers a hug wolf and goes through a strange transformation. Becoming a Hug-Wolf himself!
	Princess Monster Wife		088	May 28, 2012
The princesses are strangely losing body parts. So, Finn and Jake investigate.
	Goliad		087	June 4, 2012
Realizing her mortality, Princess Bubblegum creates an immortal replacement.
	Beyond this Earthly Realm		089	June 11, 2012
When Finn finds a porcelain lamb, it transports him into the spirit world and only the Ice King can help get him out!
	Gotcha!		090	June 18, 2012
In order to do research for her tell-all memoir about men, Lumpy Space Princess goes undercover working for Finn and Jake.
	Princess Cookie		091	June 25, 2012
Finn and Jake are called to solve a Candy Kingdom hostage crisis when a rogue cookie takes over.
	Card Wars		092	July 16, 2012
Finn and Jake play Card Quest, an epic card game.
	Sons of Mars		093	July 23, 2012
Jake becomes a copy of himself after a run-in with Martians.
	Burning Low		094	July 30, 2012
Bubblegum may be jealous when Finn starts hanging out with Flame Princess.
	B-Mo Noire		095
TBA
	Worm King		096
TBA
	Who Would Win?		097
TBA
	Lady & Peebles		098
TBA
	You Made Me!		099
TBA
	The Hard Easy		100
TBA
	Ignition Point		101
TBA
	Reign of Gunthers		102
TBA
	Help		103
TBA
	The Lich		104
TBA