The Time of the Ice Box - Pt 3

Liz is still looking at the family photograph when Jean enters the office. Jean is initially cold towards Liz but soon comes to realise that the girl she saw earlier really is her young daughter. The family reunion is broken up by the sudden entrance of Beth. She is irrationally angry that Liz has returned to the Ice Box. Jean explains that it is not Liz's fault that she has returned through the time barrier. She adds cryptically that Beth was once able to do the same. Then to a horrified Liz, she explains that Beth is in truth Liz's future self. It's the trick that the time barrier has played on them!