Jaclyn Smith, Cheryl Ladd and Shelley Hack
on the cover of TV Guide, 1979
Shelley's casting on Charlie's Angels in 1979 generated so much publicity for the TV series. Not only did the show get a new, updated and glamorous look, it got the audience interested in how the new Angel would work beside veteran Angels Jaclyn Smith and Cheryl Ladd. The series experienced a major slump in the past season, finishing at no. 12 over-all in the Nielsen ratings (It was no. 5 the first season, no. 4 the second season). Shelley's debut episode "Love Boat Angels" finished at the top of the ratings for the week it first aired.
a writeup about Charlie's Angels, TV Guide 1979