The BBC were quite sensible with this extended outing for "Dr. Who" (William Hartnell) by not being too ambitious with the visual effects. That meant that across the seven episodes of this story we could focus on developing the characters of himself as well as "Susan" (Carole Ann Ford); "Barbara" (Jacqueline Hill) and "Ian" (William Russell). They've landed the TARDIS amidst what's left of a forest that looks like it's been the victim of a nuclear war. After a brief exploration, his companions want to skedaddle but the "Doctor" is more curious, fakes a technical fault with his time machine and ...