The search for the second key takes the travellers to a jungle where Ian and Barbara come under threat from rapidly growing plants.
Did You Know?
came up with the idea of a house full of traps. Terry Nation
largely transferred this to an exterior setting because the first two episodes had already mostly taken place indoors. See more
When Ian thrusts the pickax between two of the bars of his cell, the bar to the right wobbles. See more
It must be far below zero.
Barbara, this wind's blowing right through me. We must move!
I can't. I can't move, Ian. I'm too cold.
Oh Barbara, you must move. If we don't find shelter, we don't stand a chance.