Short version: Julia was Spike’s lost love from his former life inside the Red Dragon crime syndicate. Their relationship — and the love triangle/betrayal involving Spike’s old partner Vicious — is a central element of Spike’s past that resurfaces across the series. Julia goes into hiding, later briefly reunites wit…
Where this is explored in the show: key episodes include “Ballad of Fallen Angels,” “Jupiter Jazz,” “Sympathy for the Devil,” and the two-part finale “The Real Folk Blues.” If you want, I can give a more detailed episode-by-episode recap of Julia’s story.
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