One, Two, Three! is the fifth episode of the first season of Numberblocks. Its learning objective is counting to and knowing the order of all the numbers to 3.
One sees a tree with one apple and counts the one apple. She cannot reach it. Two comes by and sees another tree with two apples. Two counts them, but he can't reach either. Three comes and is big enough to reach the apples. She counts the three apples.
She plays find the apple with three cups, labeled 1, 2, and 3. She hides the apple in the yellow cup. One guesses red cup. Two guesses orange cup. Three chooses correctly the yellow cup and eats the first apple.
There are only two apples to go. Three plays apple on top. One starts, next comes Two, then comes Three. No one can reach the top of Three's head. Three eats the second apple.
There's only one apple left. One and Two whisper in each other's ear.
Three scares the other Three.
Three eats the third and last apple, leaving One and Two hungry. Three shows them three trees with three apples. One apple is for One, and two are for Two. But he shares one with Three. They eat together.
Two and Three should have arranged their blocks horizontally when playing apple on top. Three doesn't bleed when her head pops off.