In the Cosy Room, Three is admiring her beautiful-thing collection, while Four is finding the things boring due to them not having a purpose. He brings out the Boing Ball and declares it more interesting than Three's beautiful things, but Three believes it's not allowed to play with the Boing Ball in the Cosy Room. Four, however, maintains that he's allowed as long as he's "careful".
He tries to play, but hits himself on one of Three's things, sending it bouncing out of control. Three blames him for this, so he apologises and tries to catch it, only to hit himself on her things again and fall over. She's none too pleased about this, and claims he's spoiling the beauty of her things. He points out that it was partially her fault, so she agrees to let him take one of her beautiful things if she can take one of his things.
Three takes the Boing Ball, but Four points out that this leaves him with nothing to play with while she has plenty to play with. The alarm goes off and they go to the control room, but Four is late due to spending a moment standing there in stunned silence.
Agent 28 informs the Numberjacks that two children (a boy and a girl) are having their toys stolen. Four, to spite Three, says that he knows what it's like having something taken from you and it's bad, but is his usual unsure self when Six suggests that as a reason to send him out. However, when Three promises to return his Boing Ball, he agrees to be launched.
Five has a bit of trouble finding a four for Four to land on, and when she does find one, as an address number, the one next to it gets taken. Because of this, she advises him to be vigilant.
Five and Six wonder if there is a pattern to the things that were stolen, and the agents point out that the objects were taken one at a time.
Then, someone takes a man's shovel, a waitress's apple, and another man's unicycle. Four then spots the thief: the Numbertaker. Six promises to find a way of defeating the Numbertaker and Five imagines him taking the sun (which would be bad), a cloud (which would be better since we have plenty of those) and a raindrop (which would be optimal since it would be barely noticeable).
She then has an idea: get the Numbertaker to take things that there are too many of for it to make a difference. Three makes brain gain with the message "No taking if there's only one". This works and the Numbertaker takes one of the unicycle guy's juggling balls, but then he takes another one, and another, leaving the man with only one juggling ball.
At the cafe, the Numbertaker takes all the grapes except one, very quickly, one by one. Then, Five gets another idea: make the Numbertaker take things of which there are so many that it would take him too long. Then, the agents have an idea for something that fits that description: the grains of sugar! Four spills the sugar and Three makes brain gain to make the Numbertaker take it.
The Numbertaker tries to take the sugar one grain at a time, but then loses patience and runs off to a construction site, where the Numberjacks do the same with some sand. He loses patience again and goes to the park, where they make him take blades of grass. He loses patience again and runs away, dropping all the stolen items.
Four comes back, they retell the mission, and Three and Four return each other's toys. Three accidentally sends the Boing Ball flying, and Five tells the viewers to see what body parts they have one or many of.
This episode provides examples of
- Foreshadowing: There were some hints that the Numbertaker was the thief:
- His sound effect played every time something was stolen.
- He's the most larcenous meanie.
- He could be seen wearing white.
- He used a white hook.
- I Don't Think That's Such a Good Idea: Four is initially dubious when Six suggests he go out.
- Phrase Catcher: The street performer causes Three to say, "Poor man!" twice because first he fell over, then no one liked his show.
- Poke the Poodle: Invoked. The Numberjacks make the Numbertaker take only one of many things, so that it will not be noticeable.
- Screw This, I'm Outta Here: When the Numbertaker loses patience, he runs away.
- Sticky Fingers: The main focus of the episode is the Numbertaker stealing things.
- Subverted Catchphrase: Five, instead of "Anything could happen", says, "If he keeps on taking things, what else might he take?".
- Weird Sun: Five imagines a sun with a face.
