Margaret Flores
Margaret Flores is an actress who worked as regular background actress on several seasons on  portraying a sciences officer. In addition, she also appeared in  and worked as additional stand-in for Marina Sirtis when Nora Leonhardt wasn't available. She also worked as stand-in for Sirtis on the feature films , , and . On the latter one she did the same job occasionally for Donna Murphy, including the jump into the water and water work for light settings. Flores received no credit for her work.

According to the call sheet, Flores was scheduled to appear in the fourth season episodes  and  in scenes in Ten Forward and in the episode  in corridor scenes but was either not filmed or cut from the final episodes. Flores was also scheduled to work as stand-in for Sirtis on the fifth season episode  while Nora Leonhardt was unavailable but was replaced by Debbie Marsh. Flores worked again as stand-in on the fifth season episode , this time for guest actress Michelle Forbes.

In 2017 she appeared as a cafeteria patron in The Big Bang Theory episode "The Proposal Proposal" which also featured .

Star Trek appearances 
 
  (Season 4)
 
 
 
 
 
  (Season 5)

Stand-in work 
 
  – stand-in for Marina Sirtis
  – stand-in for Marina Sirtis
  – stand-in for Marina Sirtis
  – stand-in for Marina Sirtis
  – stand-in for Michelle Forbes
  – stand-in for Rosine "Ace" Hatem
 
  – stand-in for Marina Sirtis
  – stand-in for Marina Sirtis
  – stand-in for Marina Sirtis and Donna Murphy

Performers
Stand-ins
TNG performers
Film performers