Inventions pitched include an umbrella machine, a music festival and a machine which assists a baby to sleep, all shown to a panel of multi-millionaires.
Evan Davis reviews the programme's success stories - the entrepreneurs who received funds to market their ideas. Cameras follow Charles Ejogo, who planned to put umbrella vending machines in Tube stations, jewellery designer Elizabeth Galton, magazine publisher Huw Gwyther and Rachel Lowe, whose London-based board game caught their eye.
Dominic Killinger entered the den with an impressive pitch for his start-up business providing wireless internet access to yacht owners.
He'd already signed up 50 marinas and it seemed like the perfect business for Doug Richard, a self confessed yacht and high-tech junkie. After Duncan Bannatyne told Dominic he didn't think there was a big enough market and went out early on, things began to look a little bit shaky. When Doug Richard started picking holes in his business plan Dominic looked like he might be coming undone.
Luckily for Dominic, Peter Jones came in and offered half the money he needed for 20% of his business. Theo Paphitis followed suit with exactly the same amount, so Dominic had the money he came in for but in return for 40% of his company - he came in looking to sell only 20%.
Then things in the den really started to hot up when Doug Richard offered all of the money for a massive 45% of his company in return for his vast experience in both yachting and wi-fi, only for Rachel Elnaugh to come in with an offer for the £150k for just 38%!
For the first time ever in the Den, four dragons were fighting for the same business. Who would Dominic go for? In the end he chose Peter Jones and Theo Paphitis.
Alex Hall entered the dragons' den looking for £150,000 for a 15% stake in her company The Big O which sells pre-packed marinated olives for the pub and bar market.
With an attractive, patented pole dispenser she designed herself to package her olives, the dragons agreed Alex had a good and potentially lucrative product but they all felt her presentational skills let her down.
Her answers were too evasive and defensive for the dragons' liking. What could Alex have done differently to secure the capital she required?
Presentations are key indictors as to how well organised and prepared you are for any interview or pitch situation. Even if the numbers stack up, a poor pitch can let you down.
The dragons have to decide whether to invest in an almost impossible puzzle, a liqueur made to a secret family recipe, the very latest in backpacker crockery and on-line style bible.
The dragon investors are confronted by a party-plan with a difference, a new type of bodybuilding nutrition, a revolution in shaving and a motorised surfboard - among other projects.
Peter Jones, Duncan Bannatyne, Rachel Elnaugh, Doug Richards and Theo Paphitis decide if any of the innovations will attract their cash.
Duncan Bannatyne, Rachel Elnaugh, Doug Richards, Peter Jones and Theo Paphitis offer more brutally honest advice to the would-be entrepreneurs behind inflatable concrete buildings, Japanese home cooking kits and hi-tech pooper scoopers.
Duncan Bannatyne, Rachel Elnaugh, Doug Richards, Peter Jones and Theo Paphitis challenge the would-be entrepreneurs behind an avant-garde circus, an extreme go-kart, functional jewellery and a new board game to demonstrate the profit-making potential of their products.
Peter Jones, Duncan Bannatyne, Rachel Elnaugh, Doug Richards and Theo Paphitis offer brutally honest advice to a final group of would-be entrepreneurs. Ideas up for investment include a children's meditation course, a vest that exercises its wearer's chest muscles, a revolutionary form of sick bag and a means to make working out less boring.
Proposals put forward in the first programme include a water-free egg boiler, an innovative toilet seat cover, a hi-tech coffee table and a gadget to prevent baths overflowing.
Evan Davis challenges more entrepreneurs to make their sales pitches to a panel of millionaires. Ideas put forward include a multigym in an armchair, and a business offering wash pads for HGVs and coaches at motorway service stations.
Budding entrepreneurs outline their ideas for new products and services including transparent galoshes for children, a premium-rate phone line for lost people, an innovative man-overboard warning system for boats and many more.
Evan Davis challenges more entrepreneurs to make their sales pitches to a panel of millionaires. Ideas put forward include a yoga business for children, a foot-massaging shower mat, a computerised DJ system, and a fireproof spray for yachts.
The budding entrepreneurs outline their ideas for new products and services, including a Scottish seaplane service for tourists, a hi-tech scanner to prevent underage drinking and an experiences company for single people only.
Budding entrepreneurs outline their ideas for new products and services, including an in-car charger for golf trolley batteries, a plan for a national pub poker league, a sticky pad to prevent babies from slipping out of high chairs and a building firm specialising in tradeswomen.
Some of the ideas that the Dragon's decided to pursue are updated in this special episode and it's shown whether the products and ideas ever made it onto the market.
Some more of the ideas that the Dragon's decided to pursue are revisited in this episode and its shown what happened next with the ideas.
More highlights are shown on how some of the selected ideas have got on since the show ended.
More of the ideas that the Dragon's decided to pursue are updated in this special episode and it's shown whether the products and ideas ever made it onto the market.
More hopeful entrepreneurs pitch their ideas to the multi-millionaires hoping that they will get the cash to get their ideas of the ground.
Entrepreneurs ideas this week include a media player in the shape of a teddy bear and a solution for clearing leaves away.
Ideas pitched in the Dragon's Den this week include a school for wrestlers and and a kettle which saves energy.
Inventions this week include an automatic golf trolley which keeps up with the golfer on the course.
Ideas pitched to the Dragons tonight include a nightlight which is also able to be used as a torch and an environmentally friendly boat.
This week's ideas include historic perfumes and a devise to help with tiling.
Evan Davis looks at 10 different ways to impress the Dragons. He also talks to different celebrities who are fans of the show and also talks to some of the previous entrepeneurs who pitched their ideas in the den.
Ideas pitched to the Dragon's this week include a while-u-wait gold plating service and a a celebrity look-a-like business for hen parties.
Amongst the ideas pitched to the team this week include an apron bath towel to assist with babies at bath time.
Idea this week include books being published by an unknown writer and a scheme for recycling plastic bags.
A CGI-animated entrepreneur wants investment in his company whilst somebody else has an idea for a key chain.
The ideas pitched to the Dragon's this week include a range of clothes designed to stimulate babies and Caribbean ready meals.
Ideas that are pitched this week include a jogging machine for dogs and a theme park set under water.
More budding entrepreneurs pitch their ideas to the Dragons. Ideas this week include a new type of light bulb fitting and a saddle that offers more comfort whilst out riding.
Ideas pitched this week include a bag which helps dispose of Christmas trees and a new board game. The show also takes a look at what has happened to some of the entrepreneurs since they first pitched their ideas to the Dragons.
Thie episode takes a look at the life of Theo Paphitis away from the Dragon's Den.
The series takes a look at the personal and professional life of James Caan.
Deborah Meaden's life is featured in this special episode.
This episode takes a look at the life of Peter Jones.
Duncan Bannatyne's life is explored in this episode.
The series takes a look at the different versions of the show broadcast around the world.
Ideas this week include a devise that turns air into water and an idea to make garden fences look nicer.
Victoria McGrane tries to impress the Dragons with her fashion-related business idea whilst another entrepreneur has an idea for some new in-line roller skates.
Hazel Ives tries to impress the dragons with her high wire adventure park idea as yet more entrepreneurs try to impress the Dragons with their ideas.
Racing driver Robert Hall presents an unusual pitch the the team. Brian James pitches his new men's underwear idea to the Dragons.
Ideas this week pitched include a networking Internet site for food lovers and decorated hats.
Ideas this week include a new range of children's shoes and a mobile phone dating agency.
This week's ideas include fat free curry sauces and pre scooped ice cream.
The dragons travel around the country to find out what some of those who have appeared on the show have been up to since.
The team continue to finds out what has happened to those who appeared on the show.
The Dragon's talk to more people who have appeared on the show and find out what has happened since.
The Dragon's chat to more people who have appeared on the show and find out what has happened since their appearances.
More previous entrepreneurs explain what has happened to them since their appearances on the show.
The Dragons take part in a special edition of the show for Sports Relief.
Idea pitched this week include a horror-based scare attraction and personalised romance novels.
Idea pitched to the Dragon's this week include a range of cosmetics for darker skin and an offshore Scottish mussel farm venture.
Idea pitched this week include a new musical, car servicing, a rowing machine accessory and a wheelie bin accessory.
Ideas pitched in the den this week include a regional cleaning company, a new litter bin and an offshore seafood company.
ideas this week include an online community for food lovers, single serve wine containers, bug-busting cleaning products and customisable sandals.
Samantha Gore makes a second appearance in the den with a new addition to her crime prevention business. Ronan McCarthy pitches his new shoe polish booth.
Idea pitched this week include an electric car, curry trays and a new weight loss system.
Ideas pitched this week include a range of computer mice based on classic iconic cars and an idea to get the last drop of toothpaste out of the tube.
The cameras follow Peter Jones as meets with Kirsty Henshaw who made an emotional pitch in the Den when she came in with her frozen dessert business. Peter is determined to get her product on the supermarket shelves as soon as possible. He also meets up with condiment king Levi Roots.
The cameras follow Duncan Bannatyne as eh travels the south of France to oversee his daughter's wedding. He then goes back to work to follow up on some of his Dragon's Den investments.
The cameras follow James Caan as he visits some of the people he invested in during the series.
The cameras follow Deborah Meaden as she visits some of the people she invested in during the series.
The cameras follw Theo Paphitis as he takes 90 employees to Greece for a week of team-building exercises. He also visits two companies he invested in on Dragons' Den to see how they are getting on.
Ideas pitched to the Dragon's this week include a frozen pudding business and a new road sign concept idea.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas this week include old fashioned glamour products, a new style washing line and an accessory for the use on yachts.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas this week include a collapsible bottle and a new security firm.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched tonight include a falconry business and some new kitchen utensils.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched this week include a new fizzy drink flavour.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched this week include a suitcase that turns into a cot and some musical cones.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched include a website to to sell on unwanted gift cards and a Harry Potter style wand that works as a remote control.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched this week include a website that values collectibles, a device that eliminates bathroom odours and a power tool that combines drilling and sawing functions.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running. Ideas pitched this week include a vest designed to help people loose weight and a backpack which is multi functional.
More wannabe entrepreneurs pitch their ideas to the Dragon's hoping to get investment to get their ideas up and running.
The series takes a look at the career of Hilary Devey.
Ideas pitched this week include a solar power feed-in tariff, a plastic egg, a circus act that's sure to go with a bang and a mind-changing massage service.
Ideas pitched this week include shades for canines, a never-before-seen inflatable car-based device and an offer to help everyone get the perfect looking body for just £20.
Ideas pitched this week include a new litter trays for dogs, a fancy dress business and a fence preservation company.
Ideas pitched this week include an idea for keeping holiday-makers' valuables safe and a Mexican food range.
Idea pitched this week include a pantomime company, a fast-paced delivery service and a solution to outdoor toilet needs.
Ideas this week include a new clothing range and a car that thinks it is a bike.
Ideas pitched this week include a balance bike business and a potential solution for a common problem experienced by babies and their parents.
Ideas pitched this week include a plan to revolutionise the UK housing market and unusual garden pods.
Ideas pitched this week include a plan to capitalise on the profitable wedding market and a balcony accessory.
Ideas pitched this week include a knight in shining armour-inspired kitchen product and the next Rubik's cube.