Marina Sirtis (born 29 March 1955) is an English-American actress. She is best known for her role as Counselor Deanna Troi on the television series Star Trek: The Next Generation and the four feature films that followed, as well as other appearances in the Star Trek franchise.
Denise Michelle Crosby (born November 24, 1957) is an American actress best known for portraying Security Chief Tasha Yar in Season One of Star Trek: The Next Generation as well as Yar's own daughter, the half-Romulan Commander Sela, in subsequent seasons. She is also known for her numerous film and television roles and for starring in and producing the film Trekkies. She is the paternal granddaughter of entertainer Bing Crosby.
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Marina Sirtis and Denise Crosby autographs (Star Trek)