Torchwood - Season 1 Episode 12 -

Jack and Tosh investigate when there are reports of music coming out of nowhere in an abandoned dance hall. While in the building, a temporal shift puts them in back in 1941 but they soon realize can't get back to their own time, at least not without Tosh sending those in the present day the necessary equations to make it happen. While at the dance hall, Jack runs into someone he knows, an American RAF pilot by the name of Jack Harkness. In the present day Owen, Ianto and Gwen are working to get them back. Owen wants to open the rift and try to get Diane Holmes back ...