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 40 episodes have been broadcast, most recently in February 2026.
Last episode
Hey You What If?
What if you could turn things to gold? This episode shows that it might not work out well.
Catching up on Hey You What If??
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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 2
Is it possible to build a sandcastle the size of a real castle? We imagine how it could be done, using a pneumatic drill and a huge, solid gold steamroller!
Imagine if we had a thermostat that could turn the world temperature down - could we fix global warming? But be careful, a few degrees too far could cause an ice age.
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.