S4 E1 • Episode 1

In the return of a new series former MP Neil Hamilton goes in the electric chair, there's a search for the UK's fizziest drink, which is Britain’s loudest bang, which food stuff makes the best DIY shaving cream, a lucky viewer becomes Brainiac for a day, a Hollywood star pays a visit to the Brainiac lot, how many 360 degree turns can you do without falling over, Dr. Bunhead is at a service station near you, and get ready for the world series of Brainiac darts.

Première diffusion : 16 juillet 2006

S4 E2 • Episode 2

Jon Tickle explores the colour of belly button fluff, what is the squirtiest food, the gunpowder is back to race humans, what happens when you depth charge an aquarium, Debbie McGee takes on the electric chair, who’s better - left handers or right handers, what’s the best word for a smiley photo and we kiss goodbye to another caravan.

Première diffusion : 23 juillet 2006

S4 E3 • Episode 3

How many helium balloons can it take to lift a human, what is Britain's stainiest food, Brainiac for a day blows up some melons, another Hollywood star pays us a visit, what is the best way to get rid of stress, can you eat upside-down, can you locate water by dowsing, Oliver Skeete faces the electric chair and we send more caravans into orbit.

Première diffusion : 30 juillet 2006

S4 E4 • Episode 4

The entertaining science show engages in more experiments with the main features in this episode being: Testing out the a variety of substances to determine the most itchiest, Can you run through wallpaper?, The search for the strongest bat, Finding out which food gives off the longest lasting smell and finding out if helium makes a stereo sound squeaky. More Microwaves and Caravans go boom and Derek Achorah is the celebrity on helium.

Première diffusion : 6 août 2006

S4 E5 • Episode 5

In tonight's episode of Brainiac, we are taken through a variety of experiments including: The best way to pee in a public bathroom, The most effective way to get rid of a stitch and how many strands of spaghetti can you break with your bare hands.

Première diffusion : 13 août 2006

S4 E6 • Episode 6

Can a shopping trolley break the speed limit, Jeremy Spake trys out the electric chair, what is Britain’s best DIY sneeze, can enough monkeys write Shakespeare, which is the worst food to leave lying around in your fridge, can you blow up a balloon under water and can you stop fingers going wrinkly when wet.

Première diffusion : 20 août 2006

S4 E7 • Episode 7

Which is best – dog or brainiac, Sian Lloyd tries out the electric chair, what is Britain’s messiest sandwich, which is Britain’s toughest cereal, five top tips on taking a number two in the public loo, can humans eat dog food.

Première diffusion : 27 août 2006

S4 E8 • Episode 8

In Tonight's episode of Brainiac. We go through a range of experiments including: Finding out which is the most painful place on the body to pinch, Finding out what happens if you jump at the last second of a lift-freefall, What food pets really like, What the fastest way to travel on foot is, and many more.

Première diffusion : 3 septembre 2006

S4 E9 • Episode 9

In tonights episode, numerous experiments are tried out to find out: What the bounciest ball is, what the toughest nut is, which finger is the strongest and many more. This episode is also the finale of "Brainiac Darts."

Première diffusion : 10 septembre 2006