Plot
A 12-year-old boy and his best friend, wise 28-year-old dog with magical powers, go on a series of surreal adventures with each other in a remote future.
Cast
| Name | Role |
|---|---|
| John DiMaggio | Jake |
| Jeremy Shada | Finn |
| Tom Kenny | Ice King |
| Hynden Walch | Princess Bubblegum |
| Niki Yang | BMO |
| Pendleton Ward | Lumpy Space Princess |
| Dee Bradley Baker | Cinnamon Bun |
| Maria Bamford | Additional Voices |
| Steve Little | Peppermint Butler |
| Olivia Olson | Marceline |
| Kent Osborne | Joshua |
| Cole Sanchez | Additional Voices |
| Polly Lou Livingston | Tree Trunks |
| Jessica DiCicco | Flame Princess |
| Andy Milonakis | N.E.P.T.R. |
| Jackie Buscarino | Susan Strong |
| Tom Herpich | Mr. Fox |
| Justin Roiland | Earl of Lemongrab |
| Andrew Daly | King of Ooo |
| Hayden Ezzy | Fern |
| Melissa Villaseñor | Additional Voices |
| Ron Perlman | The Lich |
| Ron Lynch | Mr. Pig |
| Steve Agee | Ancient Psychic Tandem War Elephant |
| Stephen Root | Martin |
| Keith Ferguson | Colonel Candy Corn |
| Felicia Day | Betty Grof |
| Keith David | Flame King |
| Jeff Bennett | Additional Voices |
| Ava Acres | Young Marceline |
| Kumail Nanjiani | Prismo |
| Ethan Maher | Sweet P |
| Fred Melamed | Gumbald |
| Dana Snyder | Life-Giving Magus |
| Grey Griffin | Breakfast Princess |
| Martin Olson | Hunson Abadeer |
| Tom Scharpling | Jermaine |
| Eric Bauza | Additional Voices |
| Jill Talley | Maja |
| Madeleine Martin | Fionna |
| Roz Ryan | Cake |
| Lauren Lapkus | Patience St. Pim |
| Paul Scheer | Toronto |
| Miguel Ferrer | Death |
| Emo Philips | Cuber |
| Melinda Hill | Doctor Princess |
| Katie Crown | Additional Voices |
| Lou Ferrigno | Billy |
| M. Emmet Walsh | Cosmic Owl |
| Sharon Horgan | Minerva |
| Max Charles | Toughy |
| Kristen Schaal | Jake Jr. |
| Collin Dean | Tiffany |
| Dan Mintz | TV |
| Sam Marin | Jerky Teenage Bear |
| Ashly Burch | Blacksmith |
| Jack Pendarvis | Dirt Beer Guy |
| Andy Merrill | James |
| Thurop Van Orman | Additional Voices |
| Andy Samberg | Party Pat |
| 'Weird Al' Yankovic | Banana Man |
| Davey Johnson | Xergiok |
| Jim Cummings | Blueberry Cop #1 |
| Rainn Wilson | Rattleballs |
| Isabella Acres | Young Princess Bubblegum |
| Mark Hamill | Fear Feaster |
| Noah Nelson | Kee-Oth |
| Alia Shawkat | Charlie |
| Kevin Michael Richardson | Dog House |
| Billy Brown | The Vampire King |
| Maurice LaMarche | Grand Master Wizard |
| Lennon Parham | Additional Voices |
| Tom Gammill | Glob |
| Ming-Na Wen | Finn's Mom |
| Duncan Trussell | Ron James |
| Paul Williams | The Hierophant |
| Kyle Kinane | Cloud Dance |
| James Kyson | Big Destiny |
| Marc Evan Jackson | Kim Kil Whan |
| Lena Dunham | Betty Grof |
| Jenny Slate | Huntress Wizard |
| Henry Rollins | Bob Rainicorn |
| Ashley Eriksson | Music Hole |
| Chuck McCann | Moe |
| Tipper Newton | Additional Voices |
| Tress MacNeille | Erik's Father |
| Kerri Kenney | Girl Bear |
| Kyla Rae Kowalewski | Me-Mow |
| Jonathan Frakes | Adult Finn |
| Matt Jones | Electroid |
| Erik Estrada | King Worm |
| Vincenzo Rauso | Marquess of Nuts |
| Cloris Leachman | Old Marceline |
| Reggie Watts | Additional Voices |
| Dave Foley | Warren Ampersand |
| George Takei | Ricardio |
| Kate Micucci | Bunny Mom |
| Neil Patrick Harris | Prince Gumball |
| Randy Liedtke | Additional Voices |
| Gregg Turkington | Immortal Maize Walker |
| James Baxter | James Baxter |
| James Urbaniak | Additional Voices |
| Paul F. Tompkins | Costumed Fire Actor |
| Riki Lindhome | Ice Cream |
| Livvy Stubenrauch | Bonnibel |
| Clancy Brown | Demon Cat |
| Cameron Esposito | Carroll |
| John Kassir | Cloud Groom |
| Thomas F. Wilson | Head Marauder |
| John Hodgman | DJ Plop Drops |
| Shyloh Oostwald | Additional Voices |
| Jon Wurster | Bryce |
| Ron Funches | The Fool |
| Jasika Nicole | Frieda |
| Rebecca Romijn | The Empress |
| Melany Ochoa | Candy Kids |
| Brad Neely | The Green Knight |
| ViviAnn Yee | Additional Voices |
| Pamela Adlon | Gunther |
| Alan Tudyk | Chatsberry |
| Matthew Broderick | Dream Warrior |
| Laura Silverman | Ethel Rainicorn |
| Donald Glover | Marshall Lee |
| Anne Heche | Cherry Cream Soda |
| Paget Brewster | Viola |
| Ako Castuera | Canyon |
| Thu Tran | AMO |
| Howard Kremer | Blueberry Cop #2 |
| Andres Salaff | Neddy |
| Violet Sole Closs Farley | Penny |
| Peter Browngardt | Paper Pete |
| Susie Essman | Barb |
| Jonathan Katz | The Elder |
| Helena Mattsson | Alva |
| Michael Dorn | Gork |
| Paul Reubens | Dancing Bug |
| Fred Tatasciore | Manish Man |
| Rich Fulcher | Jaybird |
| Brian Doyle-Murray | Prince Huge |
| Donald Faison | Additional Voices |
| Bobcat Goldthwait | Bird #1 |
| Wendy Linehan | Goliad |
| LeVar Burton | Bubble |
| Isabelle Fuhrman | Shoko |
| Creed Bratton | Phlannel Boxingday |
| Brett Gelman | Ringmaster |
| Minty Lewis | Erin |
| Mark Proksch | Johnnie |
| Billy West | Dr. Erik Adamkinson |
| Matt Gourley | Granny Elder |
| Chris Isaak | Seven |
| Ron Livingston | Morty Rogers |
| Rich Sommer | Grand Prix |
| David Herman | Additional Voices |
| Ghostshrimp | Head #2 |
| John Moschitta Jr. | Gnome #2 |
| Brian Posehn | Business Man #1 |
| Peter Stormare | Old Man |
| Henry Linehan | Stormo |
| Marc Maron | Squirrel |
| Aziz Ansari | DMO |
| Jessica Anne Bogart | Ladybug |
| Johnny Pemberton | Braco |
| Lucy Lawless | General Tarsal |
| Roddy Piper | Don John |
| Peter Serafinowicz | Lumpy Space Prince |
| Clark Duke | Jawbreaker Guy |
| David Ferguson | Duty Manager |
| Gillian Jacobs | Margles |
| Tig Notaro | Purple Comet |
| Brent Weinbach | Additional Voices |
| Steve Wolfhard | Ice Imp |
| Josh Fadem | Whipple |
| Steve Berg | Additional Voices |
| Michael J. Anderson | Gummy |
| Toby Huss | Booboo |
| James Adomian | Additional Voices |
| Davey Johnson | Flame Messenger |
| Alan Oppenheimer | Darren the Ancient Sleeper |
| Tamar Stevens | Candle Hooligans |
| Janet Klein | Tuber |
| Raza Jaffrey | Danny |
| Rekstizzy | Rap Bear |
| Brian Baumgartner | Georgy |
| Chris Monahan | Gumdrop Guy |
| Mandy Siegfried | Additional Voices |
| Marina Sirtis | Samantha |
| Kay Lenz | Bird Woman |
| Charlotte Newhouse | Other Fionna |
| Laraine Newman | Additional Voices |
| Jon Park | Son of Rap Bear |
| J.G. Quintel | Blue Jay |
| Jonah Ray | Bees |
| Rebecca Sugar | Marceline's Mom |
| Open Mike Eagle | Additional Voices |
| Beau Billingslea | The Moon |
| Brody Stevens | Guardian of the Mountain |
| Sean Giambrone | Shermy |
| Willow Smith | Beth |
| Bettie Ward | Poodle |
| Jacob Kepler | Butter Beans |
| Bryan Kopta | Dementor |
| Phil LaMarr | Hypno Priest |
| Tunde Adebimpe | Banana Guard #16 |
| Hannibal Buress | Flame Prince |
| Crispin Freeman | Ice President |
| Elle Newlands | Butterscotch Butler |
| Amy Sedaris | Bandit Princess |
| Fred Stoller | Additional Voices |
| Bert Youn | Lee |
| Rae Gray | Bronwyn |
| Biz Markie | Snorlock |
| Wallace Shawn | Imaginary Jake |
| Kelly Hogan | Ice Fox |