Really... sounds like Highlander.
They mess that up. The main character became mortal at the end of part 1. He became immortal at the beginning of part 2 (in the future) then mortal again. In part 3, he's still immortal cuz he's not "the one" yet and it takes place after part 1 but before part 2. He even gains the ability of being an illusionist. In part 4, the plot takes place after part 2, but before part 3. However, the main character from the television series is involved and the main character from the movie series dies. That doesn't make sense. 
Someone made a timeline for Highlander: The immortals Highlander Timeline
At the bottom, you'll see... "2000+ - anything that staed (stated) to have occured (occurred) at these dates is false. If you have seen Highlander 2 The Quickening then take a few moments now to erase that farse (farce?) from your memory."
Another Highlander timeline site: http://www.personal.utulsa.edu/~Marc-Carlson/game/hightime.txt
