Batwoman season 3 casts Agent Carter star as Poison Ivy

Batwoman season 2 finale spoilers follow.

Agent Carter's Bridget Regan is set to play Poison Ivy in Batwoman's eagerly anticipated third season.

When the DC superhero show returns in October, the actor – who played assassin and former Black Widow operative Dottie Underwood in the Marvel series – Deadline reports she'll be introduced as Pamela Isley, a gifted botanist whose life trajectory changed when she was experimented on by a colleague.

Having been injected with various plant toxins, the flame-haired scientist discovered that she had unusual abilities – and began to put them to use in the name of ecoterrorism.

Araya Doheny//Getty Images

Her dangerous methods, however, catch the eye of Batwoman and her allies, sparking conflict between herself and Team Caped Crusader.

What to Read Next

Regan is certainly no stranger to playing a baddie, given her character in Agent Carter, and regular appearances as drug lord Rose Solano in comedy-drama Jane the Virgin and con artist Rebecca Lowe/Rachel Turner in White Collar.

DC Comics

"This is going to be fun," she wrote on Instagram on Monday (August 30), acknowledging her new guest star role as she shared Deadline's original report.

News of Regan's casting comes just a few weeks after it was announced that Gotham's Victoria Cartagena would be joining the line-up as police detective Renee Montoya, while Law & Order's Nick Creegan and River Givens will be introduced as "charming playboy" Marquis Jet and his mother, Jada, respectively.

The CW

In the show's dramatic season two finale, Rachel Skarsten's villainous Alice revealed to Ryan Wilder/Batwoman (Javicia Leslie) that her biological mother didn't actually die in childbirth like she's believed all these years, and is in fact alive.

Alongside Givens' casting, it was also reported that Jada has "a deep past that forced her to give up her first-born child", so it could well be that Jada is Ryan's long-lost parent. Whether the titular vigilante will discover that fully for herself over the course of the next chapter, if that's indeed the case, is anyone's guess.

Batwoman airs on The CW in the US, and is broadcast on E4 in the UK.