Cosnett was one of the original cast members, playing CCPD Detective Eddie Thawne before his demise in the season one finale. He returned to reprise his role in seasons two, three and eight.
“We’re so excited to have Rick join us once more as we put together our final batch of emotional and thrilling episodes,” said executive producer Eric Wallace. It’s especially wonderful as Rick was an integral part of the show’s inaugural season. So having him return to help us conclude our show’s incredible nine-year run was more than a privilege. It was a no-brainer.”
Letscher had recurring roles as multiple different versions of Eobard Thawne and the Reverse-Flash, in the first three seasons and seasons seven and eight.
“Having the incredibly gracious and talented Matt Letscher return for our final season was something we couldn’t resist,” said Wallace. “So, we created a very special story for him, one we’ve been excited to tell for a while, but couldn’t until now. The result is a wild and bittersweet episode we hope fans—both old and new—will love.”
Kennedy was first introduced in the Arrowverse in the 'Crisis on Earth-X' crossover that featured episodes of Supergirl, Arrow, The Flash (2014), and DC's Legends of Tomorrow. It was later revealed that she was the daughter of Barry (Grant Gustin) and Iris (Candice Patton) from the future. She appeared in 33 episodes of The Flash, most recently in its eighth season.
“The Flash has always been a show about the importance of family. So having the incredible Jessica Parker Kennedy back as fan-favorite speedster XS was always in the cards,” said Wallace. “As the daughter of Barry and Iris, Jessica’s already made an unforgettable mark on our show’s history. And with her latest Season Nine adventure, Jessica’s taking her incredible portrayal of Nora West-Allen to even greater heights in a way the audience has never seen before.”
The final season of The Flash premieres Wednesday, February 8 on The CW.