The American television series that adapts the format used by Britain's Dragons' Den is Shark Tank. It presents entrepreneurs to a panel of investors who may offer money in exchange for a stake in the business.
Shark Tank premiered in the United States in 2009, after the international format had already been adapted in other territories. The American title changes the animal metaphor from dragons to sharks, but the basic television mechanism remains recognisable: a founder makes a concise pitch, answers questions and negotiates with potential investors.
The two programmes are related but are not the same production. Dragons' Den is the British version associated with the BBC, while Shark Tank is the US version associated with ABC. Investor line-ups, deal structures and the businesses shown are different in each country, so an investor appearing on one programme should not automatically be assumed to appear on the other.