Familiar face and former Dragon Theo Paphitis makes an explosive return to the Den as he stands in for Touker Suleyman, who is recovering from a short illness. Theo Paphitis joins red-hot investors Sara Davies, Peter Jones, Deborah Meaden and Tej Lalvani in the famous chairs.The line-up may be different but negotiations are as tough as ever as entrepreneurs pitch for the deal that could transform their businesses. Ideas include a diet plan app from an entrepreneur with a glowing record in the industry, a Cornish clothes-mending workshop, and a device that helps cyclists rescue slipped chains. Also bidding for investment is an animal-loving entrepreneur whose doggy treat range includes canine birthday cakes – but will she be celebrating?