Hey You What If?
Hey You What If? is a comedy program on CBBC. We answer the ‘what if’ questions that you never even thought to ask! Each episode asks a question and takes you on an unforgettable journey where the impossible is made possible to find the answer! The program has been available since 2025. A total of 45 episodes have been broadcast, most recently in February 2026.
Last episode
Hey You What If?
A fun run goes wrong when one ambitious runner tries going at the speed of sound.
Catching up on Hey You What If??
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Would it be possible to live on an Earth shaped like a doughnut? You might be surprised!
Find out why living in slow motion would let you see things no-one else can!
Want to reach for the stars? It would be the journey of a lifetime - literally.
What if you could turn things to gold? This episode shows that it might not work out well.
Some day people will live on the moon – find out just what they are in for.
If you have always wanted to shrink yourself, this is the episode for you!
It really is possible to time travel into the future, and the team show you how!
The planet is being destroyed - but this episode demonstrates the things you can do to help save it.
Things don’t quite go to plan when the moon turns into cheese.
Find out why stopping the Earth from spinning isn’t such a good idea.
Clouds might look like cotton wool, but if they really were, things would get very messy.
Good news - it’s possible to levitate! Bad news – there are some serious side effects.
Experience the ultimate in long-distance travel - a holiday on Mars!
Find out why turning into a huge giant would be no fairy tale.
What would happen if there really was a lift that took you all the way up to space?
The deepest hole humankind ever dug only got one thousandth of the way through the earth. But what would happen if you kept digging?
Experience the most extraordinary ride in the universe – falling into a black hole.
Series 1, Episode 20 - You Try to Catch a Falling Star?
Expected on
What happens if you try to catch a falling star? Spoiler alert - probably best not to try!