In honour of scary media month: what is the first piece of media you remember truly frightening you as a child?

The Enemy Within episode of Star Trek. Specifically, the scene where Good Kirk ill-advisedly releases Evil Kirk from his restraints in sickbay. I was so scared I ran out of the house into the street. Eventually I crept back indoors and watched the rest of the episode from behind the lounge door.

13 April 1970. I was seven.

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