Liz's mother meanwhile finds she has a psychic connection to her daughter when she is in another time. She knows when Liz is in danger, and has a small degree of insight into what is happening. The children are captured and taken before the officer in charge, a younger Commander Traynor. The Naval station is ostensibly researching into the new radar technology, where they encounter Liz's father {who in 1970 has no memory of what happened in 1940}, Frank Skinner, as a young naval rating, serving under Commander Traynor.

The base is captured by the German commandos, led by the scientist Gottfried, who is determined to discover the real nature of the research taking place at the base. Skinner has orders to disable the laser ray, the real secret of the base, but in doing so is struck by a beam of energy to his head (causing his amnesia).

By a trick, Liz and Sarah are able to get back to 1970. Next day, after an aborted attempt when the barrier was not there, Liz goes back to 1940 to try and find out what happened to her father and to see what the Germans learned about the laser project. Liz is shot but though there is blood and pain, there is no wound. Seeing that she is really unharmed, Liz recovers instantly. However her mother in 1970 thinks she is dead, but later sees her as still alive in 1940. Gottfried has found the laser's ruby but Traynor refuses to reveal it's purpose. He threatens to take him back to Germany but Traynor turns the tables on him. Gottfried and his men escape back to Germany and Liz and Simon head back to the fence and 1970, but instead find themselves freezing in the middle of an ice field. They collapse as episode six ends.