Highlander! My first fandom! *tear* All of your questions seem to be answered here - and someone's directed you to highlander.org, which has the most complete FAQ that I know about. Couple other things - just because I saw them mentioned:
Where do Immortals come from? There was, unfortunately, a second Highlander movie, which attempted to explain Immortals as aliens from the planet Zeist. However, if you ask any HL fan about this they will start saying, "What? Hunh? I don't...I can't hear you. No, what?" while revving the nearest loud motor. The "Seeds" story which someone mentioned can be found here (http://www.galacticfed.com/mcdonald/seeds.html) at the author's website -- and I highly recommend her other stories as well.
Couple other people have mentioned this, but it's worth repeating - there is a difference between movie canon and series canon. (And only the first movie is worth watching, so please, don't hurt yourself on the others.)
As to whether Immortals can sense pre-Immortals or not, it seems to vary. Connor and Duncan picked up on Richie's pre-Immie status, but other Immortals he came into contact with didn't seem to. So handwave that away to experience, or to whether Richie's pre-Immortal Buzz was masked by Duncan's. (The FAQ will go into all this, I promise.)
Give a shout again if you have more questions - always happy to revisit the old fannish ground. :)
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Where do Immortals come from? There was, unfortunately, a second Highlander movie, which attempted to explain Immortals as aliens from the planet Zeist. However, if you ask any HL fan about this they will start saying, "What? Hunh? I don't...I can't hear you. No, what?" while revving the nearest loud motor. The "Seeds" story which someone mentioned can be found here (http://www.galacticfed.com/mcdonald/seeds.html) at the author's website -- and I highly recommend her other stories as well.
Couple other people have mentioned this, but it's worth repeating - there is a difference between movie canon and series canon. (And only the first movie is worth watching, so please, don't hurt yourself on the others.)
As to whether Immortals can sense pre-Immortals or not, it seems to vary. Connor and Duncan picked up on Richie's pre-Immie status, but other Immortals he came into contact with didn't seem to. So handwave that away to experience, or to whether Richie's pre-Immortal Buzz was masked by Duncan's. (The FAQ will go into all this, I promise.)
Give a shout again if you have more questions - always happy to revisit the old fannish ground. :)