Silk Satin was a female criminal and later British agent during World War II. She would cross paths with the Spirit several times over the years.
Their first encounter occurred when she was aiding a gang of criminals in stealing a valuable medallion. The Spirit, caught her in the act, returned the stolen item and kissed her. This act caused Satin to instantly fall in love with him. Though she realized that he already belonged to another, she continued to lament over him throughout her life. 
- 6 Appearances of Sylvia Satin (Earth-Spirit)
- 3 Images featuring Sylvia Satin (Earth-Spirit)
- 6 Quotations by or about Sylvia Satin (Earth-Spirit)
- Character Gallery: Sylvia Satin (Earth-Spirit)