…. that Doctor Who first appeared on a TV screen.

The episode was entitled An Unearthly Child and starred the wonderfully tetchy William Hartnell as the Doctor and Carole Ann Ford as his granddaughter Susan.

It wasn’t until four weeks later that the enemy who became synonymous with the series, the Daleks, entered the natons’ consciousness.

The title music was composed by Ron Grainer and its haunting, and at the time futuristic, nature was realised by Delia Derbyshire of the BBC Radiophonic Workshop.