The next car is probably a fart car, where everything is just a fart.
|—Sad-One and Glad-One bickering over what the next car will be at the pilot.|
One-One is a companion of Tulip, trying to help her find a way back home. One-One can split into two halves, each with its own personality. The two halves are called Sad-One and Glad-One by the production staff, but as a single unit, they are called One-One. One-One is also the true conductor of the Infinity Train.
One-One is a white robot with a black stripe that runs down the entire circumference of its spherical body. On the front, the black stripe has two white dots that appear to be Sad-One and Glad-One's eyes when they are fused. One-One has four retractable spider-like legs.
The body can easily separate into two identical and independent parts and can reattach itself together again. Each half is semi-spherical in shape with a black line at their base with a single white dot, their eye. The flat base of each half has four spider-like legs, similar in structure to when it was whole.
Not much is known about One-One other than they are the conductor and was ripped out of the control panel by Amelia after they refused to create a car for her. After having their memories wiped, One-One was planted in the snow car by Amelia, where Tulip first meets them.
PersonalityAs One-One is a single robot composed of two independent parts, it has two separate personalities. As a single unit, One-One often flickers between the two different personalities.
Sad-One, the sad half of One-One, is morbidly pessimistic, practically always having a monotone voice and acting very downcast no matter the situation. Sad-One is almost always in a state of despondency, often shooting down any hopeful remarks. Though Sad-One is always pessimistic, it will sometimes drop pearls of wisdom that, ironically, encourages people.
Glad-One, the glad half of One-One, is cloyingly optimistic. It has a strong sense of happiness, never speaking in a voice that is not overjoyed. Glad-One never deviates from his happiness and will always see life in the most optimistic way possible. Glad-One is also very naive, to the point of doing things with reckless abandon. Its naiveté, mixed with its strong sense of optimism, makes Glad-One have a strong lack of self-preservation.
The Grid Car
One-One is seen by Tulip sitting atop a snowman. One-One questions if Tulip is his "mother", which she declines, but still befriends and takes along the journey home. He and Tulip play around in the Grid Car until a Ghom enters it, Tulip asking One-One to make a wall with a small hole around the door so they can exit the car without the Ghom following. One-One is successful in doing so, and they escape unharmed, beginning the trip to the engine.
The Beach Car
One-One is traded to the Cat in exchange for the aforementioned feline asking the Conductor to let her leave. One-One bids an unwilling farewell to Tulip, though Tulip feels immense grief and allies with Randall to chase down the Cat and break the deal. One-One is retrieved again.
The Corgi Car
One-One accidentally alerts the Steward to their location, though once the Steward realizes that One-One is present, it ceases its attack.
The Crystal Car
One-One tries to connect to the crystal through song, though his idea of a song is dial-up noises, so it fails. He sings with Tulip to make the Giant place the staircase up.
The Cat's Car
One-One briefly questions if a globe seen in The Cat's Car is his mother. One-One says "we don't like you." to The Cat before exiting the car.
The Unfinished Car
One-One's conductor instinct kicks in, seeing the sloppy work of Amelia and feeling a large necessity to "fix" the car. He ends up causing a massive hysteria with the citizens. One-One keeps telling himself that "it's [his] fault", likely referring to how he let Amelia take over and create sloppy cars such as this. Tulip makes him snap back to normal, and he apologizes.
The Chrome Car
One-One distracts the Mirror Police while Tulip convinces Mirror Tulip to help.
The Ball Pit Car
One-One has fun playing around until the Steward crashes the party. One-One is told to escape by a captive Tulip, who rolls into a tube, but the Steward opens fire and makes it appear as if One-One is dead. He is revealed to be okay after the Conductor and her subordinates leave, and tries to find a way to help Tulip restore Atticus.
The Past Car
He joins the Cat and Tulip in Amelia's tape. He is able to manipulate the tape to see more than what others would normally see.
One-One finally reunites with the Infinity Train, conducting it once more. He opens a new exit for Tulip and bids a final farewell to her. One-One also appears in the final scene of the season, confirming a return of the series.
- One-One's two personalities share similar traits with Wheatley from Portal and Marvin from The Hitchhiker's Guide to the Galaxy.
- According to Tulip, One-One has been on the Infinity Train its whole life.
- Sad-One is left-handed. This has correlation with many popular medieval beliefs that the left hand is the hand of deviance, sadness, and destruction. The right hand is seen as being the hand of happiness and prosperity, (hence the positivity with the word, "right," in the English language).
- One-One makes an appearance in the background of one of the shorts in Cartoon Network's miniseries Villainous.
- One-One's design was inspired by Star Wars, and other sci-fi robots.
- One-One is one of many heroes that got turned to stone in "Crossover Nexus", a crossover episode in the show "O.K. KO" that uses most of Cartoon Network's shows.
- Another reference to One-One being the true conductor of the train is shown in the actual Logo of the show, as the infinity symbol is actually the two halves of One-One.
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