Marlene Kratz is a fictional character from the Australian soap opera Neighbours, played by Moya O'Sullivan. She made her first appearance during the episode broadcast on 5 July 1994. She was introduced as the estranged mother of Cheryl Stark. The pair often argued and Marlene constantly interferes in other people's business, but O'Sullivan believed Marlene meant well. She also described her as enormously caring, but Cheryl struggles to forgive Marlene for leaving her and her father. As she settles in, Marlene opens a bric-a-brac store and is often up for a scam or a bet. She also has a brief romance with Colin Taylor. The character was written out in mid-1997 and exited the serial on 14 October 1997, when she went on a three-month cruise and never returned. O'Sullivan reprised her role for the show's 20th anniversary episode, which was broadcast on 27 July 2005. Marlene revealed that she is still sailing the seas.

Cheryl Stark is a fictional character from the Australian television soap opera Neighbours, played by Caroline Gillmer. She made her first appearance during the episode broadcast on 26 July 1993. Colette Mann took over the role for eight weeks from late 1995 to early 1996 when Gillmer fell ill. In September 1996, Gillmer departed the show and Cheryl was killed off.