"We have to get the Double Back to stop!" — Ones This page is protected from being moved, though users can still edit it unless it is protected.
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It's time for a time travel adventure! Sixty-Four's new time machine keeps sending the Numberblocks back in time. Can they double up in time to fix it?
This episode's description used to show that it's a crossover with Alphablocks, but it was later removed.
This tweet from the Numberblocks Twitter gave the impression at the time that this was a mistake, and that there wasn't going to be any crossover special, at least not in the near future. However, crossoverspecials between Alphablocks and Numberblocks have come out since then.
This episode was put on iPlayer on Friday, two days before it aired on TV.
This episode's logo is a parody of the movie "Back to the Future".
Sixty-Four's time machine is a parody of the DeLorean car.
This episode has a time-travel plot, where a certain character travels back in time to change an event in the past.
The type of time-travel featured in the episode is a time loop, where the main character gets sent back 2 minutes in the past, in an altered timeline, with the only difference being that the main Numberblock is twice their size. This repeats until Sixty-Four is the one heading to Sixty-Four's time machine, to plug the time regulator.
There are a total of six different timelines in the episode.
This special establishes yet another urban area the Numberblocks live in, akin to the Big City from The Wrong Number or the city seen in Odd Side Story.
Prior to 2022; American Xfinity televisions count this episode as a show and this being ”Numberblocks: Double Back - S1E1".