You probably remember the first time you saw a kid in a suit solve a math problem involving a giant blob of guacamole. It was weird. It was fast-paced. Honestly, it was a little bit brilliant. When Sinking Ship Entertainment and Fred Rogers Productions launched the show back in 2014, nobody really expected the cast of the Odd Squad to become such a revolving door of talent. But that’s the thing about a show where the main characters are strictly kids—they grow up. Fast.
If you’re sitting there wondering why Agent Olive isn't around anymore or how many "Ms. O's" there have actually been, you aren't alone. The show is built on a "graduation" system. Once an agent gets too old (or loses their "oddness"), they move on. It’s a clever narrative trick to keep the show fresh, but it makes keeping track of the actors a bit of a headache.
The Original Duo: Dalila Bela and Filip Geljo
The show lived or died on the chemistry of the first two leads. Dalila Bela played Agent Olive, the serious, seasoned veteran, and Filip Geljo played Agent Otto, the "I’m just happy to be here" rookie.
Dalila Bela was perfect for the role because she could deliver deadpan lines about gadgets like the "Doubler-Inator" without cracking a smile. Since leaving the cast of the Odd Squad, Dalila hasn't exactly slowed down. Most people recognize her now as Diana Barry from Anne with an E. It’s a massive jump from solving math crimes to 19th-century period drama, but her ability to play grounded characters started in that Precinct.
Then there’s Filip Geljo. He’s had perhaps the most high-profile "post-Odd" career move. If you went to see Avatar: The Way of Water, you saw him. He plays Aonung of the Metkayina clan. It’s wild to think that the kid who was obsessed with juice boxes in a PBS Kids show is now part of one of the biggest film franchises in history.
Why the graduation happened
Kids grow. It's a logistical nightmare for a series that wants to maintain a specific "kid-vibe." By the end of Season 1, Dalila and Filip were visibly maturing. The showrunners, Tim McKeon and Adam Peltzman, decided to lean into this. Instead of ignoring the aging actors, they wrote a finale where Olive and Otto ran their own precinct.
Millie Davis: The MS. O Legend
We have to talk about Millie Davis. While the other agents came and gone, Millie stayed. She played Ms. O (the first one, anyway) for years. She’s the boss. She screams. She loves juice boxes.
Millie Davis is a veteran in the industry now. Beyond the cast of the Odd Squad, she’s been in Wonder alongside Julia Roberts and played Summer in the hit series Orphan Black. Her longevity on the show provided the connective tissue the audience needed while the field agents were being swapped out every couple of seasons. Eventually, even Ms. O had to move on, handing the reigns over to a new generation.
The Second Generation: Olympia and Otis
When Season 2 rolled around, fans were skeptical. Could anyone replace Olive and Otto?
Enter Anna Cathcart (Agent Olympia) and Isaac Kragten (Agent Otis).
Anna Cathcart is arguably the biggest star to come out of the show. Her energy as Olympia was infectious—a total 180 from Olive’s stoic nature. After her time in the cast of the Odd Squad, Anna became a household name for Gen Z as Kitty Song Covey in the To All the Boys I’ve Loved Before trilogy and her own spinoff series, XO, Kitty.
Isaac Kragten brought a mysterious, almost "secret agent" vibe to Otis. He’s gone on to do some grittier work, appearing in Breakthrough and the thriller The Kid Detective. The contrast between the two made Season 2 feel like a buddy-cop movie, which solidified the show’s formula: the cast can change, but the dynamic stays the same.
Season 3 and the Mobile Unit
By the time Season 3 arrived, the show underwent its biggest shift yet. It wasn't just a new cast of the Odd Squad; it was a new format. The Odd Squad Mobile Unit (OSMU) took the show on the road.
- Agent Opal: Played by Valentina Herrera.
- Agent Omar: Played by Jayce Alexander.
- Agent Oswald: Played by Gavin MacIver-Wright.
- Agent Orla: Played by Alyssa Hidalgo.
This group felt different. Orla, for instance, was an agent from ancient times who had been frozen in a tube. It added a layer of fish-out-of-water comedy that the previous seasons lacked. Jayce Alexander’s Omar brought a level of "chill" that balanced out the chaos.
The British Era: Odd Squad UK
Most recently, the franchise expanded across the pond. This brought in a whole new set of faces for the cast of the Odd Squad, including stars like Kaden Coley and Gurnita Kaur. This version of the show keeps the DNA of the original but swaps the North American suburban setting for British landmarks and a slightly different comedic sensibility.
It’s a bold move. Usually, when a show reboots with an entirely new cast in a new country, it fails. But because Odd Squad is built on the idea that this is a global organization with thousands of agents, it actually makes sense.
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Behind the Scenes: The Adult "Kids"
One thing people forget is that the cast of the Odd Squad includes some pretty famous adults playing recurring roles. Sean Michael Kyer (Agent Oscar) was the tech genius for years, and while he was a kid during the run, his character was written with the soul of a middle-aged IT professional.
And then there are the villains.
- The Shadow: A recurring mystery.
- Odd Todd: Played by Joshua Kilimnik.
- Flahoose: Various guest stars.
The villains often provide the best "straight man" comedy against the kids' absurdity. Joshua Kilimnik, who played the disgraced Agent Todd, was particularly good at playing a character who was just genuinely annoyed by math.
Realities of Production
Working with a cast this young means strict labor laws. They can only film for a certain number of hours a day. They have to do school on set. If you look closely at some of the later episodes in a season, you can sometimes see an actor has hit a growth spurt mid-production. Their pants might be a little shorter, or their voice might have dropped half an octave.
Common Misconceptions About the Cast
A lot of people think the actors are replaced because they "quit" or because of "drama."
That’s almost never the case here.
The producers have been very open about the fact that they want the show to be a training ground. It’s a "job" for the characters, and it’s a "job" for the actors. When the kids turn 14 or 15, they look like high schoolers. You can’t really have a high schooler playing a 10-year-old agent without it feeling "off."
Another misconception? That the actors do their own stunts. While the "stunts" in Odd Squad are mostly just falling into piles of stuffed animals or being covered in slime, there are stunt doubles involved for anything involving harnesses or complex movement. These kids are professionals, but they’re still kids.
What to Expect Next
The cast of the Odd Squad will likely continue to evolve. As the UK version gains steam and the OSMU moves into different territories, the "alumni" list will only grow.
If you’re a fan or a parent of a fan, the best way to keep up is to follow the actors on social media—many of them, like Anna Cathcart and Dalila Bela, are very vocal about their appreciation for their "Odd" roots. They often post throwback photos from the set, proving that even though they've graduated, they’re still part of the family.
Actionable Takeaways for Fans and Collectors
- Track the Alumni: If you enjoyed a specific agent, check out their IMDb. Most of these kids move into major Netflix or Disney+ productions within two years of leaving the show.
- Watch the Specials: Episodes like "World Turned Odd" feature multiple generations of the cast. It’s the best way to see how the different eras of agents interact.
- Check the Credits: Many former cast members have returned to voice characters in the animated segments or provide cameos in later seasons.
- Understand the Format: Don't get too attached to a specific duo. The show is designed to refresh every 2-3 years to maintain its core demographic appeal.
The legacy of the show isn't just the math—it's the fact that it has become one of the most successful talent incubators in modern children's television. From the Metkayina reefs of Pandora to the rom-coms of South Korea, the former agents are everywhere. It’s pretty odd, but it works.