Here is a list of the remaining and rumoured flashbacks for season 3. Thanks very much to DarkUFO for this list, posted below the cut:
Episode 8 Desmond (Confirmed)
Episode 9 Jack (Confirmed)
Episode 10 Hurley (Confirmed)
Episode 11 Sayid (Confirmed)
Episode 12 Claire (Confirmed)
Episode 13 Locke (Confirmed)
Episode 14 Nikki/Paolo (Confirmed)
Episode 15 -- Danielle/Sawyer (Rumoured)
Episode 16 -- ?????
Episode 17 -- Charlie or Desmond (Rumoured)
Episode 18 -- ????
Episode 19 -- ????
Episode 20 -- ????
Episode 21 -- ????
Episode 22 -- Ben (Rumoured)
Posted by Cerberus on 13 Feb 2007 at 17:39 | Lost Spoilers
