According to Soap Central, Megan Hathaway came to Salem in 1984 with her adoptive father Maxwell Hathaway. She returned in hopes of getting back together with her high school sweetheart, Bo Brady. Megan did everything she could to regain Bo's love, including trying to pass off a little boy as their child, per Soap Spoiler. However, Bo had already moved on to Hope Williams (Kristian Alfonso), who was in a loveless marriage with Larry Welch (Andrew Massett).
During her time in Salem, Megan found out that she was the daughter of Salem's biggest villain, Stefano DiMera (Joseph Mascolo). Back in the 80s Stefano used Megan to help him find and harness the power of the three prisms. She was dedicated to helping her father get his hands on the medical technology the prisms held. However, her strong feelings for Bo continued to get in the way of her work for Stefano (via Soap Dirt).
Megan was so obsessed with the idea of being with Bo again that she even plotted to kill Hope. However, things didn't go as planned for Megan, who found herself falling victim to her own plan.
