Theo Paphitis joined the British television series Dragon's Den in its second series.
Paphitis is a British-Cypriot entrepreneur and retailer who became known for building businesses in retail and consumer services. His commercial experience gave him a strong connection to the programme's emphasis on products, brands, retail distribution, and scalable companies.
The timing is useful for separating the show's original panel from its early additions. The first series featured the initial group of investors, while Paphitis became part of the panel in series two. Deborah Meaden, another especially well-known Dragon, arrived later, so the two names should not be treated as interchangeable answers to this question.
Paphitis later became one of the programme's best-known former Dragons and continued to be associated with business advice and investment outside television. The question asks about his entry point into the British series, not the year he started in business or the series in which another investor first appeared.