Greta was one of the mysterious Others and was stationed in an underwater DHARMA station called The Looking Glass, along with Bonnie. Her assignment to the station was done in secret, known only to Ben Linus
When Charlie swam down to The Looking Glass to switch off the jamming equipment, Greta and Bonnie apprehended him at gunpoint. Bonnie violently tried to get information from Charlie, but Greta tried to calm her down. Greta tried a softer approach when speaking to Charlie. She and Bonnie argued for some time about what to do with Charlie, and eventually decided to break radio silence and call Ben Linus.
Mikhail Bakunin arrived to sort out the situation and was surprised to see Bonnie and Greta there, as he was told that they were on assignment in Canada. Greta told Mikhail that Ben ordered them not to tell anyone that they were at the station. After speaking with Ben, Mikhail eventually killed Greta and shot Bonnie in the back. Greta's lifeless body fell into the moon pool of the station.
- 3x21 - Greatest Hits: Introduction; captures Charlie
- 3x23 - Through the Looking Glass (2): Killed by Mikhail