Denise Crosby is an actress and model who portrayed Gretchen Kelly in three episodes of the second season.
She is best known for playing Lieutenant Natasha "Tasha" Yar in Star Trek: the Next Generation and is the granddaughter of famous entertainer Bing Crosby.
Characters portrayed by Denise Crosby on the show
Denise was the first Star Trek: The Next Generation cast member to appear on the show. Her co-star Jonathan Frakes (Commander William Riker) later appeared in Season 3 with his wife Genie Francis as Tim and Amber Lake.