The BBC's switch to colour for Pertwee's first season in 1970 couldn't be reflected in Australia, where colour broadcasting was experimenting in 1972–1974 but didn't commence final transmission until March 1975. Nearly all of the Pertwee era was first screened in Australia in black and white, with his final season the first to premiere in colour around the country at various times between 1975 and 1977. (Stories from Pertwee's first four seasons weren't broadcast in colour for the first time until the ABC purchased additional repeat rights to numerous blocks of those serials between 1978 and 1986).