Timeslip - introduction, credits and first scene

'Timeslip' (1970) British children's sci-fi series.

Simon (Spencer Banks) and Liz (Cheryl Burfield) are teenage friends who fall into a time hole and find themselves trapped in various periods of the 20th century, where they encounter all sorts of adventures. Many of them involve the nefarious Commander Traynor (Denis Quilley), who is also travelling in time.