I remember watching an English language (probably live-action) film as a kid (on the TV, but I don't think it was a series) about which I remember the part where there was a group of people who could turn invisible when they held their breath and, at one point, they are almost given away while hiding when one (possibly a child) can't hold thier breath long enough. They were possibly aliens. This would have been early 80s, I think, but possibly an older movie being reshown. What movie was it?
closed as off-topic by JNat♦ Jan 19 '18 at 11:34
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Based on the holding-one's-breath-to-turn-invisible plot device, the time-period, and the match of many other descriptions you gave, I'm guessing this is the film you are looking for.
In the comments for this video, someone posted:
"Thank you for uploading this. I must have seen it when it aired on NBC in '82, because I remember the "holding your breath to turn invisible" thing, and particularly the scene shown briefly at 3:04. It's been bugging me for decades, wondering what this movie was. Now I know. :D"