Star Trek: Deep Space Nine Spotlight - Ezri Dax - Nicole de Boer

When your commanding officer - and one time best friend in another 'life', Captain Sisko - sums you up like this, "She's a Dax. Sometimes they don't think; they just do." - you know your life is one big roller coaster ride.  For Ezri Dax (Nicole de Boer), the more accurate way to sum up her life would be to go plural - as in multiple lives.  As a Trill, she's a joined species - a host and a symbiotic lifeform.

After Terry Farrell, who originated the role of Lt. Dax on Deep Space Nine left the series, Nicole de Boer was brought in to replace her in the seventh and final season of the syndicated show.  And since Trill sort of do the old body swap as a rule anyway, viewers weren't left as shell shocked as when some TV shows plug in a new performer swapped for an old.