Jennifer Jason Leigh (The Machinist) will join the cast of the hit ABC drama as the mother of Emily (Emily VanCamp).
"What we really wanted to do in season two was expand our world, so we are going to see Emily's mum," Loy confirmed to TV Guide. "We're going to explore some different themes this season, like free will, and we're also introducing another character from Emily's past."
The producer also revealed that viewers should expect "heartbreaking" scenes, as an undercover Emily is unable to reveal her true identity to her mother.
"We learn the whole backstory and what happens between her and Emily when she was a little girl, and why she stayed away all these years," Loy explained.
Revenge star VanCamp recently admitted that she is "so excited" to work with Leigh.
"It is just about finding someone incredible," she said. "We need that with this show. I couldn't be happier."
Revenge will return to ABC on September 30. In the UK, the series airs on E4.
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Watch a promo for Revenge season two below: