Melissa Benoist is hanging up the cape.

Supergirl will conclude with its upcoming sixth season, the CW, Warner Bros. TV, and Berlanti Productions announced Tuesday. It was not made clear whether the network canceled the show or the showrunners decided season 6 would be the end. The writing team has already started mapping out the 20-episode final season, which will begin production in Vancouver, Canada, later this month.

Credit: Dean Buscher/The CW

"To say it has been an honor portraying this iconic character would be a massive understatement," Benoist wrote in an Instagram post after the news broke. "Seeing the incredible impact the show has had on young girls around the world has always left me humbled and speechless. She's had that impact on me, too. She's taught me strength I didn't know I had, to find hope in the darkest of places, and that we are stronger when we're united. What she stands for pushes all of us to be better. She has changed my life for the better, and I'm forever grateful."

Debuting in October 2015, Supergirl aired on CBS in its first season, which had more of a villain-of-the-week structure and chronicled Kara Danvers' (Benoist) attempts at balancing being a superhero with working at CatCo. The series jumped over to the CW for its second season, and over the past five years has explored immigration, gun control, and other timely issues. In its fourth season, it made history by casting Nicole Maines as Dreamer, TV's first transgender superhero.

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Supergirl wasn't conceived as part of the Arrowverse, but that changed toward the end of season 1 when The Flash's Grant Gustin crossed over for one episode, which established that both shows took place on separate Earths within a multiverse. Of course, that connection to the Arrowverse deepened when Supergirl changed networks and became part of the annual Arrowverse crossovers. The most recent crossover, "Crisis on Infinite Earths," ended with all the Arrowverse shows — Supergirl, The Flash, DC's Legends of Tomorrow, Black Lightning, and Batwoman — being merged onto one Earth.

With this news, Supergirl will become the second Arrowverse series to end. Arrow, the show that started it all in 2012, concluded its eight-season run in January. However, this doesn't mean the CW is saying goodbye to the House of El completely, because Superman & Lois, starring Tyler Hoechlin and Elizabeth Tulloch as the titular couple, is joining the network's lineup this winter.

Benosit added in her post: "I'm so excited that we get to plan our conclusion to this amazing journey, and I cannot wait for you to see what we have in store. I promise we’re going to make it one helluva final season. ♥️ el mayarah."

Supergirl will return for its sixth and final season in 2021.

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Kara (Melissa Benoist) steps out from her super-cousin’s shadow to become Supergirl and defend National City in the third Arrowverse show.

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