By the end of the first episode, a mysterious man wearing a gas mask shows up and paints a line ... an executive producer for his company Atomic Monster. The season (now series) finale aired ...

More than 40 million gas masks were issued. In America there was a gas mask for children that looked like Mickey Mouse, with the character's nose and ears and even a picture of him on the gas filter.

Now put your books down…and get your gas masks out. Quietly. Now take them carefully out of their boxes - no, no, Isobel, don't drag at it…you show her how to do it, Margaret, will you.