The season was met with largely positive critical reception. In addition, several episodes and writers were nominated for awards; the episode "Thank You" was nominated for an Annie Award as well as an award at the Sundance Film Festival. "Too Young" was nominated for an Emmy Award. Storyboard artist Rebecca Sugar was also nominated for an Annie Award.

26 Episodes

Conquest of Cuteness
Morituri te Salutamus
Memory of a Memory
Hitman
HitmanEpisode 4
Too Young
Too YoungEpisode 5
The Monster
The MonsterEpisode 6
Still
StillEpisode 7
Wizard Battle
Wizard BattleEpisode 8
Fionna and Cake
What Was Missing
Apple Thief
Apple ThiefEpisode 11
The Creeps
The CreepsEpisode 12
From Bad to Worse
Beautopia
BeautopiaEpisode 14
No One Can Hear You
Jake vs. Me-Mow
Jake vs. Me-MowEpisode 16
Thank You
Thank YouEpisode 17
The New Frontier
Holly Jolly Secrets: Part I
Holly Jolly Secrets: Part II
Marceline's Closet
Paper Pete
Paper PeteEpisode 22
Another Way
Another WayEpisode 23
Ghost Princess
Ghost PrincessEpisode 24
Dad's Dungeon
Dad's DungeonEpisode 25
Incendium
IncendiumEpisode 26

Cast of Adventure Time

PW
Pendleton WardLumpy Space Princess (voice)
OO
Olivia OlsonMarceline the Vampire Queen (voice)
JS
Jeremy ShadaFinn the Human (voice)
JD
John DiMaggioJake the Dog (voice)
TK
Tom KennyIce King (voice)
HW
Hynden WalchPrincess Bubblegum (voice)
NY
Niki YangBMO / Lady Rainicorn (voice)
PL
Polly Lou LivingstonTree Trunks (voice)
JR
Justin RoilandEarl of Lemongrab (voice)
AA
Ava AcresYoung Marceline (voice)
AB
Ashly BurchBreezy (voice)
RR
AS
Andy SambergParty Pat
NH
Neil Patrick HarrisPrince Gumball
MH
Mark HamillFear Feaster
MW
M. Emmet WalshCosmic Owl
JU
James UrbaniakRat King / Leaf Beard
TO
GT
George TakeiRicardio
KO
Kent OsborneBounce House Princess
DG
Donald GloverMarshall Lee
GD
Grey DeLisleIce Queen
AC
LS
Laura SilvermanEthel Rainicorn
HR
Henry RollinsBob Rainicorn
JH
John HodgmanDJ Plop Drops
PR
Paul ReubensGnome Ruler/Dancing Bug (voice)
BD
AO
Alan OppenheimerDarren the Ancient Sleeper/Sun (voice)
BB
Beau BillingsleaThe Moon (voice)
EB
Eric BauzaButtersotch Butler (voice)
BB
Brian BaumgartnerGeorgy / Private
TH
Toby HussBooboo / Commander
DF
HB
Hannibal BuressFlame Prince
CF
Crispin FreemanTurtle Prince
PS
Peter SerafinowiczLumpy Space Prince
EN
Elle NewlandsButterscotch Butler
MB
Matthew BroderickDream Warrior
DM
DF
Donald FaisonPrincess Cookie
KL
Kay LenzBird Woman
DB
Dee Bradley BakerMr. Cream Puff / Mr. Cupcake / Chet (voice)
MB
Maria BamfordManfried / Chocoberry / Candy Corn Girl (voice)
JB
Jackie BuscarinoEclair Boy (voice)
SL
Steve LittleZombie Candy Heart / Peppermint Butler / Gumball Guardian #2 (voice)
MP

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