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 2026. A total of 52 episodes have been broadcast, most recently in September 2026.
Last episode
Hey You What If?
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!
Catching up on Hey You What If??
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Experience the most extraordinary ride in the universe – falling into a black hole.
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?
Series 2
We take inspiration from the natural world as we imagine a new kind of superhero that can walk up walls.
We try out a crazy idea from science fiction to build a giant sphere around the sun and give us more energy than we'll ever need.
Sometimes you want to go surfing, but it's too far to the beach, so we try surfing on land with the help of a volcano and some giant fans.