Dragon's Den originally broadcast on BBC Two when the British series premiered in 2005.
The programme brought entrepreneurs into a studio to pitch businesses to wealthy investors, seeking money in exchange for an ownership stake. BBC Two was the BBC channel associated with the show's launch and its early run.
The title uses the plural possessive “Dragons'” because several investors sit on the panel. This is distinct from the US version, Shark Tank, which uses “sharks” for its investors. The British series is part of an international format that began in Japan.
Later scheduling and spin-off programming can cause confusion about the show's channel history, but the original British broadcast home was BBC Two.