Athlete Adam Gemili races a Red Arrow, Rachel travels through a wall of fire and former teacher Romesh returns to the classroom armed with new technology. Ben harnesses the power of Joey Essex's brain to power a car.
Rachel discovers how technology is making the dreams of the father of a bride come true. Romesh races against a drone and a white van man. Ben is strapped inside a 250kg wrecking ball set on a course to hit Romesh.
Ben unlocks the explosive potential of sugar, Romesh tries to discover how to score the perfect goal and Rachel finds out what it is like to live in space like British astronaut Tim Peake.
Romesh is dangled over a pit of hungry crocodiles with only a vacuum cleaner to save him, Ben travels to Paris to meet a friendly robot and Rachel carries out her own tests into the placebo effect.
The team look at how technology is used in the food industry and also test a sonic fire extinguisher. Rachel Riley meets the British engineers working on the 1,000mph Bloodhound SSC car.
Rachel rides along a steel cable suspended 60ft above the ground using an unusual bike. Romesh discovers how science is used in the dating industry and Ben witnesses the switch-on of a new 'fusion' reactor.
