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"You can't just sing any old thing!"S
This episode contains a song and its page has its lyrics. If you know how it goes, you can sing along!
Note: the lyrics are sometimes on the transcript to prevent browser crashes.

Four, guess..PNG

"I don't think I've seen One (episode) before!"Four
This page is about the episode. For the character, see One (character). For the comic, see One (comic).

One is the first episode of Season 1 of Numberblocks. It is the first episode in the series overall.


A little block falls out of the sky, meets her numberling and discovers one wonderful world, singing and counting to one.


A small red block falls from the sky. The block then grows a body. As she wonders who she is, a number 1 jumps on her. She sings and counts 1 of everything. She claims that she is number one!


  • This is the only episode with one Numberblock.
  • This is the first episode of Numberblocks.
  • This is the only time where at the end of the episode, we fade to black and the credits start.
  • This is the first episode to debut One.
    • In the credits of this episode and all other episodes up to "Ten Green Bottles", we see these things:
      • The year says "2016" although this episode was aired on January 23rd 2017. It is possible that Numberblocks began developing the show in early 2016. This happened with all the other episodes of Series 1 and 2.
      • Marcel McCalla, Teresa Gallagher and David Holt's names appear on the credits, despite none of them voicing in this episode.
        • If that is true, then that would mean that the beta Numberblocks would exist much earlier, possibly as early as 2014.
  • This episode and "Another One" originated from an old comic.
    • One used to have 2 eyes and was white with black limbs. Other than those, the episode functions the same.
  • This episode has the most reenactments done. Episodes such as Once Upon A Time retread the story, and ones like Land of the Giants are basically a "what-if?", only this time, with different numbers (such as 10 instead of 1). This also happens in Twoland, with Twos instead of Ones.
  • This episode aired exactly four years after the Alphablocks episode Crash aired.