S01E01 The Wrong End of Time - Pt 1
The year is 1970. A young girl called Sarah is walking along the boundary of a disused naval base in St. Oswald beyond a sign which clearly says "Ministry of Defence. Keep Out" She stops...
Simon and Liz exit the time barrier and find themselves back in the Ministry Field in 1970. As the two make their way back home, Simon reluctantly finds himself thanking Liz for returning to find him. Liz says that she didn't. Simon tells her that they must prevent the future they have seen from happening.
Simon Randall and Liz Skinner discover the existence of a strange anomaly, known as the “Time Barrier”, that enables them to travel in time to different historical periods in alternate pasts and futures.