"Doctor Who's" first regeneration, from William Hartnell's First Doctor to Patrick Troughton's Second Doctor, was first screened in Australian by ABS-2 Adelaide on Friday 7 July 1967, then elsewhere during July and September.From mid-1969 into the 1970s the ABC returned Doctor Who to a mostly weekly schedule, typically in an early-evening Friday timeslot or late-afternoon on Sundays.