Originally an adult who worked for Amanda Waller, Tremor was recreated for the New 52 as a teenage member of The Movement.
Roshanna Chatterji was born into a proud but poor Bengali family. Her father was a content, and respected farmer in Kolkata, India. But because of her power to emit vibration waves, she was regarded as a "witch" by her village. They then moved to America, where she ended up being part of a bad crowd. One night, after drinking with her friends, they got into a car accident wherein Roshanna was the single survivor. Ashamed of what happened, she was unable to face her family, and decided to run away. Amanda Waller then found her and hired her to infiltrate The Movement.