Gemmell has appeared three times in the BBC's police drama "Waking the Dead", playing two different characters. Her first appearance was in 2002 in the episode Special Relationships as DI Jess Worral, a former lover of DSI Boyd. She next appeared in the episode Sins of seventh season in 2008 as Linda Cummings, an exceptionally intelligent serial killer. Gemmell reprised the role of Cummings in Endgame, the fourth episode of the eighth season of the show. The storyline had Cummings manipulating Boyd and revealed that Cummings' accomplice was responsible for the drugs overdose that killed Boyd's son Luke. The role reprisal of Cummings is a first in the show's history.