Apex predators are the animals at the very top of their food chain - with no enemies whatsover! Author and illustrator Steve Jenkins tells us about some of the most incredible predators the world has ever seen and what's made them so impressive.

We also explore what the brain's made of with our science expert Tom, venture underwater to check out a golf-ball sized octopus that packs a venomous punch and answer once-and-for-all whether Usain Bolt could beat a cheetah in a race!