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 51 episodes have been broadcast, most recently in March 2026.
Last episode
Hey You What If?
Venus has acid rain, crushing pressure, and is hotter than an oven, so it might not sound like the ideal place to live. However, up in the clouds it's almost just like home.
Catching up on Hey You What If??
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From cloning to 3D printing, what if we could actually make copies of ourselves?
Bugs might be annoying, but we would soon regret it if we got rid of them - all our favourite foods would disappear, and there would be dung everywhere!
Wouldn't it be cool to be able to walk through walls? From turning into a gas to quantum trickery, we discover why it wouldn't be quite as useful as you'd like.
Series 1
Is it really possible to teleport? Spoiler alert: it could end in disaster!
Series 2
Could you build a slide to the other side of the world? You would need to start in space, use the slippiest slide ever and make sure you have enough supplies before you go down it!
Series 1
A fun run goes wrong when one ambitious runner tries going at the speed of sound.
Anyone can fly like a bird – you just have to travel across the solar system to do it!
What would happen if there really was a lift that took you all the way up to space?
See what would happen if you really could switch off the sun.
Empty the oceans and you’d see hidden wonders, but you’d also cause the end of the world.
It’s the ultimate baking challenge: making a gingerbread house you could actually live in.
Why waking up with lizard powers would make you useless on earth but a superhero in space!
What happens if you try to catch a falling star? Spoiler alert - probably best not to try!
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!