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Season 4 premiered on April 2, 2012. Episode titles were posted on the Frederator Blog in March 2012.[1]

Writing of the season had started by May 2011.[2] The season saw the premiere of the 100th episode of the series, "The Hard Easy" (previously titled "Prince Huge"). Adam Muto reported that characters not seen since the earlier seasons would return, with The Earl of Lemongrab, Magic Man, the Lich, Hunson Abadeer and Neptr being confirmed to return. Prior to the season's airing, Adam Muto said that Marceline's backstory would be explored further, and Jeremy Shada also mentioned that Marceline and Ice King would sing together,[3], which took place in the episode "I Remember You." The season featured guest voices by Donald Faison, George Takei, Erik Estrada, Andy Milonakis, Emo Phillips, Bobcat Goldthwait and Susie Essman. The season featured one complete two-parter ("Return to the Nightosphere" and "Daddy's Little Monster"), however the season's introductory episode was a continuation of the season 3 finale, and the season 4 finale continued into season 5's two-part opening episode.

No. overall No. in season Title card Title Viewers
(in millions)
Prod. code Airdate
79 1 Titlecard S4E1 hottothetouch "Hot to the Touch" 2.655[4] 1008-082 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.
80 2 Titlecard S4E2 fiveshortgraybles "Five Short Graybles" TBA 1008-079 April 9, 2012
A series of short stories all centered around the five senses.
81 3 Titlecard S4E3 webweirdos "Web Weirdos" TBA 1008-081 April 16, 2012
When Finn gets trapped in a giant spider web, he ends up playing marriage counselor to a couple of grumpy arachnids.
82 4 Titlecard S4E4 dreamoflove "Dream of Love" TBA 1008-080 April 23, 2012
Tree Trunks is courted by an oinking suitor, but much to Jake's dismay, this interferes with her baking habits.
83 5 Titlecard S4E5 returntothenightosphere "Return to the Nightosphere" TBA 1008-085 April 30, 2012
Marceline’s dad banishes Finn and Jake to the Nightosphere, and it stinks. Literally.
84 6 Titlecard S4E6 daddyslittlemonster "Daddy's Little Monster" TBA 1008-086 April 30, 2012
Finn and Jake attempt to rescue Marceline and find out what's making her behave so strangely.
85 7 Titlecard S4E7 inyourfootsteps "In Your Footsteps" TBA 1008-083 May 7, 2012
Finn and Jake befriend a bear, but what are the bear's intentions?
86 8 Titlecard S4E8 hugwolf "Hug Wolf" TBA 1008-084 May 14, 2012
Finn discovers a hug wolf and goes through a strange transformation. Becoming a hug wolf himself!
87 9 Titlecard S4E9 princessmonsterwife "Princess Monster Wife" TBA 1008-088 May 28, 2012
The princesses are strangely losing body parts. So, Finn and Jake investigate.
88 10 Titlecard S4E10 goliad "Goliad" TBA 1008-087 June 4, 2012
Realizing her mortality, Princess Bubblegum creates an immortal replacement.
89 11 Titlecard S4E11 beyondthisearthlyrealm "Beyond this Earthly Realm" TBA 1008-089 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!
90 12 Titlecard S4E12 Gotcha "Gotcha!" 2.392[5] 1008-090 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.
91 13 Titlecard S4E13 Princess Cookie "Princess Cookie" TBA 1008-091 June 25, 2012
Finn and Jake are called to solve a Candy Kingdom hostage crisis when a rogue cookie takes over.
92 14 Titlecard S4E14 cardwars "Card Wars" TBA 1008-092 July 16, 2012
Finn and Jake play Card Wars, an epic card game.
93 15 Sons of Mars title card "Sons of Mars" TBA 1008-093 July 23, 2012
Jake becomes a copy of Magic Man after a run-in with him.
94 16 Titlecard S4E16 burninglow "Burning Low" 3.504[6] 1008-094 July 30, 2012
Princess Bubblegum may be jealous when Finn starts hanging out with Flame Princess.
95 17 Tumblr m8cn18XNWl1qzrbk9o1 1280 "BMO Noire" TBA 1008-095 August 6, 2012
BMO tries to find Finn's sock.
96 18 King Worm title card "King Worm " TBA 1008-096 August 13, 2012
All of Ooo appears in Finn's vivid dream.[7]
97 19 Lady and Peebles Title Card 1 "Lady & Peebles" 2.754[8] 1008-098 August 20, 2012
Princess Bubblegum and Lady Rainicorn search for a missing Finn and Jake.
98 20 Titlecard S4E20 youmademe! "You Made Me" TBA 1008-099 August 27, 2012
When a creepy sleep-peeping Lemongrab upsets Princess Bubblegum with his creepy ways, Finn and Jake need to tend to some issues in the Outer Realm.
99 21 Who Would Win title card "Who Would Win" TBA 1008-097 September 3, 2012
Finn and Jake challenge a monster to a fight but end up battling each other.[9]
100 22 Ignition Point title card "Ignition Point" 2.256[10] 1008-101 September 17, 2012
Finn and Jake sneak into the Fire Kingdom and are caught in a family feud.[11]
101 23 The Hard Easy Title Card "The Hard Easy" 2.643[12] 1008-100 October 1, 2012 [13]
Mudscamps seek protection from the Mega Frog who's attacking their swamp.
102 24 Reign of Gunters title card "Reign of Gunters" 1.845[14] 1008-102 October 8, 2012[15]
Gunter and his doppleganger cause chaos in Ooo.[16]
103 25 I remember you title card "I Remember You" 2.535[17] 1008-103 October 15, 2012
Ice King and Marceline bond over memories. [18]
104 26 Titlecard S4E26 thelich "The Lich" 2.589[19] 1008-104 October 22, 2012
A visit from the Lich sheds light on Land of Ooo's secrets.

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