The anthology science fiction television series Out of the Unknown aired on BBC2 over four series between 4 October 1965 and 30 June 1971. The first two series were made and broadcast in black and white, and the latter two in colour. Many Out of the Unknown episodes were adaptations of short stories and novels. In such cases, the list below credits the story to the original author and lists the adapter in the following column. Instances where an adaptation was broadcast under a title different from that of the original work are footnoted as appropriate. Where a script was an original commission, the screenwriter is credited as the author and the “Adapted by” column is marked “n/a”.