| One | |
|---|---|
| Battle for Dream Island character | |
 One as she appears in Battle for Dream Island: The Power of Two | |
| First Episode Appearance |
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| Final Episode Appearance |
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| Created by | Cary and Micheal Huang |
| Character played by | Michael Huang (X Finds Out His Value) Emily Pitcher (SonderingEmily, Battle for Dream Island: The Power of Two onwards) |
| In-universe information | |
| Species | Algebralien |
| Gender | Female |
| Significant other | Main antagonist of the fifth season, Battle for Dream Island: The Power of Two |
| Home | Equation Playground |
One (1) is an Algebralien and the main antagonist of Battle for Dream Island: The Power of Two, created by Cary and Micheal Huang. She made her first canon appearance in the stinger of "Outbreak At Stake", where she emerges from the damaged Moon, which she was ostracized in by Four and the other Algebraliens after the murder of her friend Three in 2009. Prior to that, she first debuted in "X Finds Out His Value" and was shown as a recommended character in "The Tweested Temple".
She had her first major role in "What's Up Bell's String?", where she is seen kidnapping characters and making deals with them. Her main motivation becomes clear in "Alone", being to retrieve the powers from all of the other Algebraliens in order to undo the death of Three.
Appearances[]
X Finds Out His Value and The Number Playground Chronicle![]
One appeared on the 2008 educational video X Finds Out Value in one scene. One is also mentioned in The Number Playground Chronicle! by Three.
Battle for Dream Island[]
One in the thirteenth episode of Season 5, Category One
Before being the main antagonist of the fifth season, One appears as a recommended character in the second and fourth seasons.
One started her role as a main antagonist in the next season, Battle for Dream Island: The Power of Two. In "Outbreak At Stake", One breaks herself out of the moon to greet the audience. This is One's first canonical appearance outside of the credits.
In "What's Up Bell's String?", One is first seen after teleporting Bomby and Bell behind a bush. She says it would be a great idea for them to get to know each other, teleporting the two alongside herself away. When the teams begin to swap, One switches up all the contestants to form them before they can choose them. During the challenge, One grabs Fanny and teleports her to an unknown location. The two sit down in chairs. One tries to spark up a conversation, and also mentions that she had been watching them for a while. She offers Fanny a new mouth, convincing her she was one of Two's old friends, adding that they could help each other out. Fanny reluctantly agrees, and gets her mouth back. One makes her sign a contract before teleporting her back to the grasslands.
In "Alone", it's revealed that One is lonely because the others won't hang out with her. Usually being ignored by the others, such as Two & Four. This leads her to wander off before she happens to find a meteorite of Yoylite. After finding out this gives her powers, she wants to use this as an opportunity to finally be acknowledged by the other numbers. She wants to reveal this to Three, but is ultimately worried the others might find out about the meteorite and ruin it, but does it anyway.
Three without knowing reveals it to the others, but she doesn't know about this but One knew so One got angry at Three for sharing powers, even though One doesn't understand that Three didn't know so she shatters her to pieces, traumatizing the algebraliens. She tries to recover Three, but when she did, Threes value was broken, traumatizing the algebraliens. Later One goes to the place where she found the Yoylite, but Four and X come over. X felt uncomfortable, but Four had no remorse, and held One with his powers. Four and the other algebraliens take One to the moon and open it, drop her in it, and then closed it with a magic seal so she couldn't use her powers to get out. She was stuck in the moon for 14 years. In TPOT 9 her backstory starts, and later in TPOT 15, it's revealed she made a deal with Leafy. Then at the end One puts depowered Four in the Moon, and does something Bad to Nine.
The first series episode thumbnail where One is featured is the 20th episode of the 5th season Alone, which was released on YouTube on October 17, 2025.
As of Alone, One currently has kidnapped characters from competing and hosting: Bomby, Bell, Fanny, Ice Cube, Basketball, Leafy, Barf Bag, Needle, Gaty, Donut, Black Hole, Four (host of the previous season, Battle for BFDI/BFB and the temporary host of the current season) and Pencil.
Reception[]
One's dimension as seen with One and Basketball in the 13th episode Category One
Despite One being the main antagonist of the fifth season, fans considered One as the best antagonist of all seasons of any BFDI season, placing her in First place position. In 2025, One plush became available for sale at the shopping selection for the first time.