Adventure Time: Fionna and Cake is a strange beast. It is a spin-off of a show that ended over a decade ago, set in a multiverse where Finn the Human and Jake the Dog have swapped genders and become Fionna the Human and Cake the Cat. It is also a show that has had to recast nearly everyone in its original cast, a fact that hangs over every episode like a ghost at a party.
The premise is simple. Fionna and Cake live in a world without magic, and they spend their days hopping between universes with the help of Simon Petrikov, the former Ice King. A shadowy antagonist lurks in the shadows. That is the setup. The execution is where things get interesting.
Trailer, via HBO Max.
The Cast Problem
The show’s biggest hurdle is also its most obvious. Madeleine Martin returns as Fionna and Roz Ryan returns as Cake, but nearly every other character has a new voice. Simon Petrikov is now voiced by Tom Kenny, and that is a good call. Kenny brings a warmth and a quiet sadness to the role that fits the character’s arc across both seasons.
But then there is Huntress Wizard, voiced by Ashly Burch. Burch is a huge fan of the original show and wanted to honor the character, which comes through in her performance. She is not a replacement so much as a fresh take. The same goes for Marshall Lee and Gary, who were recast with Kris Kollins and Harvey Guillén. None of these actors sound like their predecessors, and the show leans into that difference rather than trying to recreate the past.
Recasting and Its Costs
The recasting is a real problem, though. It is not just a matter of different voices. When you change the person behind a character, you change how that character feels. Adam Muto said the crew wanted to do different takes on established characters without making them sound like their previous voice actors. That is a noble goal, but it also means the show is constantly rebuilding its emotional foundation.
There is also the practical side of modern streaming production. Some actors were unavailable, and some roles needed to be filled quickly. The show handles this by leaning on its core duo and letting the supporting cast shift around them. It works in the first season, less so in the second, where the expansion of the cast adds strain to the storytelling.
The Multiverse Hook
The multiverse concept is the show’s strongest asset. Each episode sends Fionna and Cake to a new world, and the show uses these settings to explore different versions of the same story. The show does not describe specific episode formats like robot, fantasy or noir versions, but the general approach holds up. It allows the show to play with its own mythology without repeating itself.
The antagonist is less successful. The shadowy villain lurking in the shadows is a standard threat, but the show never fully commits to why this danger matters beyond the plot mechanics. It is a device, not a character. The show would be stronger if it spent more time building the stakes around this threat rather than treating it as a given.
Season Two’s Expansion
The second season premiered on October 23, 2025. It introduces Huntress Wizard as a central figure, and the show uses her to expand the scope of the story. The season also deals with the death of M. Emmet Walsh, who voiced the Cosmic Owl. Frank Collison took over the role after Walsh passed away in 2024, and the character is temporarily kil.
The season also sees more recasting. The Lemoncarbs, the gender-swapped human version of Lemongrab as twin sisters, appear with Cree Summer voicing them alongside Jinkx Monsoon. The show continues to juggle its legacy while building something new.
What Works and What Doesn’t
The show is at its best when it is playful and confident. The animation is sharp, the jokes land, and the chemistry between Martin and Ryan remains the heart of the series. The show knows its own rules and plays within them, even as it breaks them.
Where it falters is in pacing. The second season, in particular, feels stretched thin. With more characters and more worlds to explore, the show loses some of the intimacy that made the first season special. The antagonist’s plan never quite clicks, and the show spends too much time explaining its own mythology rather than letting the story breathe.
The show is also a product of its time. It is an adult animated series on HBO Max, which means it can lean into darker humor and more mature themes. That is a double-edged sword. Some episodes feel like they are trying too hard to be edgy, and others feel like they are playing it safe. The balance is uneven, but the show mostly lands somewhere in the middle.
Final Word
Adventure Time: Fionna and Cake is a show that is trying to do something ambitious. It is taking a beloved franchise and remaking it from scratch, using the same characters but giving them new lives. That is a tall order, and the show does not always meet it. But when it does, it is genuinely excellent.
The recasting is a constant presence, and it will likely continue to be a talking point for fans. But the show has found a way to honor its past while moving forward. It is a tribute to the original series, but it is also its own thing.
The show is worth watching for anyone who loved the original Adventure Time, and for anyone who enjoys clever writing and strong voice acting. It is not perfect, but it is a solid entry in a franchise with a rich history.
Key Facts Box
- Show: Adventure Time: Fionna and Cake
- Creator: Adam Muto
- Network: Max, HBO Max
- Seasons: 2
- Episodes: 20
- First aired: August 31, 2023
- Last aired: December 25, 2025
Voice Cast
- Madeleine Martin as Fionna
- Roz Ryan as Cake
- Tom Kenny as Simon Petrikov
- Ashly Burch as Huntress Wizard
- Harvey Guillén as Gary
- Kris Kollins as Marshall Lee
- Cree Summer and Jinkx Monsoon as the Lemoncarbs
The show is a reminder that nostalgia is a tricky thing. It can pull you back, but it can also hold you back. Adventure Time: Fionna and Cake understands that tension and tries to navigate it with wit and warmth. It is not a perfect show, but it is a sincere one.
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