I remember seeing a rerun or old video or something of Spearhead From Space when I was younger and I became hooked. I had heard of Doctor Who before (I think it was on the Fifth Doctor at the time) and so carried on watching from there while swapping old videos with friends from school. A group of about 5 of us were big fans and we would trade or buy videos from each other. It was like a little drugs ring
Never looked back!