A husband-and-wife duo hope to get the Dragons' taste buds tingling with their Welsh super-food delicacy, a dapper entrepreneur aims to impress with his male fragrance product, and a London businessman offers a slice of his Michelin-starred food delivery service. Will any of our Dragons join him for the ride, or will he walk away empty-handed?

A self-assured Scottish entrepreneur pitches his fitness company for children, a businesswoman looks for investment in her authentic ethnic snack business and an engineer enters the Den with his self-igniting wood burning stove but sadly fails to spark the interest of Peter Jones. Finally a tech whizz-kid showcases his new take on the dating app but will it be a match made in heaven when he meets the Dragons?

The Dragons are pitched effervescent wheatgrass tablets, customised in-ear headphones and a dapper teacher seeks investment in his online male grooming business. Finally, an Irish husband and wife team enter the Den with their range of baby products but when Touker Suleyman breaks one of their products, will they ever manage to secure investment from the Dragons?

An entrepreneur gets emotional when pitching her language teaching for kids, a businessman with a security device for patio doors tries to lock in some Dragon cash and a couple with an innovative device for the hard of hearing get short shrift when they discuss their business set-up. Finally, one half of a duo behind a soup range enters the Den, but with his business partner too camera shy to face the Dragons, will he be able to withstand their interrogation alone?

An American entrepreneur is hoping for investment in her range of dolls with historical tales to tell, a young Italian duo are hoping the Dragons will see the design flair and commercial possibilities in their bicycle indicator lights and a couple of bee keepers try to tempt the Dragons with their honey-infused drink. Will the Den be a hive of investment activity or will there be a sting in the tale?

Touker Suleyman gets more than he bargained for when he agrees to road test an intimate waxing product, an entrepreneur makes a shocking revelation about sleeping on his office floor and a serial inventor who says he has reinvented the surfboard and designed a parachute for NASA brings his latest garden shed invention to the Den.

The Dragons ponder the investment potential in pop-up inflatable igloos, a meat-free hot-dog restaurant concept and a canine poop-scooping device. Will the Dragons find the product barking, or will dog-lover Deborah Meaden be tempted to take a punt?

Two former army captains hope to get the Dragons to stand to attention with their bespoke gifting business. A young duo pitch their innovative ticket comparison site and a pair of multimillionaire entrepreneurs are seeking cash from the multimillionaire Dragons for their new safety device. Will the Dragons have finally met their match or will they see the potential in a deal?

Dragons' Den: Pitches to Riches returns to relive extraordinary encounters between brave entrepreneurs and those formidable Dragon investors. Den expert Richard Osman guides us through the most outstanding, shocking and emotional pitches of the last two years.

Richard catches up Caner Velli, who dazzled the Dragons with his liquid repelling product, we see the pun toting duo from a pork scratching company in their new HQ and Peter Jones visits the Dhillon family, who left the Den with a trio of Dragon investors in their boot cleaning brush, but have they all gone from pitch to rich?

A Scottish entrepreneur bearing chocolate gifts, a couple of city slickers selling socks and a teacher trying to get the party started with his dance mats are all hoping the Dragons are feeling generous in the season of goodwill. And finally, for the tennis coaches offering active holidays, will it be game over or will they walk away with a sack full of cash?

A former panel beater hopes to seal a deal with the Dragons with his innovative nail gel product. An inventor from Dublin is looking to rinse the Dragons of some capital with his unique toilet-flushing gadget for kids, and a dapper businessman with a parking app stuns the Den with his company valuation. Will his technology impress the Dragons enough to secure investment or will they put the brakes on a deal?

A former merchant navy officer turned product designer tries to make a stand with his novel tablet holder. Two proud parents pitch their organic skincare product for the booming baby market and a young entrepreneur hopes to impress with an activity monitor for pets. Will the Dragons see the potential in his innovative product or will he be left in the dog house?

A transatlantic duo pitch their unique coffee lid to the Dragons. An entrepreneur hopes to entice the Dragons with a range of coconut-based products and a passionate hairdresser hopes to revolutionise the hair and beauty market with his safety device. Will he be able to strike a deal with the multimillionaire investors?

Tensions are running high as an entrepreneur ruffles some feathers in the Den when he fails to clarify his restaurant business model, a husband-and-wife duo fight to defend their innovative drilling tool gadget, and it is sink or swim for a businessman pitching his portable water-saving product. But will any of the Dragons see the potential in his eco-friendly design, or will they wash their hands of it?

It is handbags at dawn as high street textile tycoon Touker Suleyman clashes with the entrepreneurs behind a fledgling fashion business. The Dragons also ponder the profits in pork scratchings, and a device for folding paper has the Den in creases. Will Deborah Meaden, the Dragon with the most famous fingers in finance, be tempted to invest?

The Den's five multimillionaire investors probe the money-making potential in wearable maps, interference-free guitar cables and an entrepreneur with a business selling manhole cover keys that has come back from the brink of bankruptcy. Will it be second time lucky for the plucky entrepreneur, or will he see his investment hopes go down the drain?

In the series opener, the Dragons ponder the investment opportunity in pint-sized pencils, oversized beanbags and a boot-cleaning device invented by a 15-year-old football fan. But will the revelation of a huge company debt mean it is game over for this fledgling family business?