This the list of episodes.
Season 1 2010:
Slumber Party Panic
Trouble in Lumpy Space
Prisoners of Love,Tree Trunks
The Enchiridion!
The Jiggler
Ricardio the Heart Guy
Business Time
My Two Favorite People
Memories of Boom Boom Mountain
Wizard
Evicted!
City of Thieves
The Witch's Garden
What is Life?
Ocean of Fear
When Wedding Bells Thaw
Dungeon
The Duke
Freak City
Donny
Henchman
Rainy Day Daydream
What Have You Done?
His Hero
Gut Grinder
Season 2 2010-2011:
It Came from the Nightosphere
The Eyes
Loyalty to the King
Blood Under the Skin
Storytelling
Slow Love
Power Animal
Crystals Have Power
The Other Tarts
To Cut a Woman's Hair
The Chamber of Frozen Blades
Her Parents
The Pods
The Silent King
The Real You
Guardians of Sunshine
Death in Bloom
Susan Strong
Mystery Train
Go With Me
Belly of the Beast
The Limit
Video Makers
Mortal Folly
Mortal Recoil
Heat Signature
Season 3 2011-2012:
Conquest of Cuteness
Morituri Te Salutamus
Memory of a Memory
Hitman
Too Young
The Monster
Still
Wizard Battle
Fionna and Cake
What Was Missing
Apple Thief
The Creeps
From Bad to Worse
Beautopia
No One Can Hear You
Jake vs. Me-Mow
Thank You
The New Frontier
Holly Jolly Secrets Part I
Holly Jolly Secrets Part II
Marceline's Closet
Paper Pete
Another Way
Ghost Princess
Dad's Dungeon
Incendium
Season 4 2012:
Hot to the Touch
Five Short Graybles
Web Weirdos
Dream of Love
Return to the Nightosphere
Daddy's Little Monster
In Your Footsteps
Hug Wolf
Princess Monster Wife
Goliad
Beyond this Earthly Realm
Gotcha!
Princess Cookie
Card Wars
Sons of Mars
Burning Low
BMO Noire
King Worm
Lady & Peebles
You Made Me!
Who Would Win
Ignition Point
The Hard Easy
Reign of Gunters
I Remember You
The Lich
Season 5 (Some of this episodes maybe not air it ):
Finn the Human
Jake the Dog
Five More Short Graybles
Up A Tree
All the Little People
Jake the Dad
Bad Little Boy
Davey
Mystery Dungeon
Little Dude
All your fault
Vault of Bones
The Great Bird Man
Simon and Marcy
Puhoy
A Glitch is a Glitch
One Last Time
Princess Potluck
BMO Lost
James Baxter the Horse
Shhh
The Suiter
The Party's Over,Isia de Senora
Another Five Short Graybles
LSP gets robbed
Only Wizards Allowed