As the Television Critics Association summer event rolls on, and showrunners and audiences alike prepare for the upcoming fall TV season, a lot of news is emerging concerning your favorite series. There's a good bet that, if you're reading Collider, some of those shows include DC Comics' TV Universe series like The CW's The Flash and DC's Legends of Tomorrow, and Fox's Gotham. (Even CW Seed is getting in on the action with the first-ever superhero series led by a gay character!) It's news from this trio of live-action WB and DC TV shows that we've rounded up for you today.

For casting announcements, first looks, and new images, take a look at our DC TV breakdown below. The Flash kicks off its third season on Tuesday, October 4th at 8pm; Gotham returns for Season 3 on Monday, September 19th at 8pm; and Legends of Tomorrow starts its second season on Thursday, October 12th at 8pm. Set your DVRs accordingly!

'The Flash' Casts Grey Damon as Mirror Master

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Image via Vivian Zink/NBC

First up from The CW's The Flash is their newest casting announcement. CBR reports that Grey Damon (Aquarius) will join Season 3 as a major comic book antagonist, Mirror Master. He'll appear in the fourth episode and will take on the character's original alter ego of Sam Scudder.

Created by John Broome and Carmine Infantino and first introduced in 1959's "The Flash" #105, Scudder was your run-of-the-mill convict who became obsessed with trying to get inside mirrors and his own reflection. Lo and behold he discovered a way to do it and then used this ability to commit crimes and antagonize The Flash. The New 52 also features Scudder as the Mirror Master in a storyline which sees him and other Rogues granted superpowers by an experiment gone wrong, one which inextricably links them with their signature weapons. Scudder, who becomes permanently trapped within the Mirror Realm, blames Captain Cold for this, as do the other Rogues. Intriguing!

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Image via DC Comics

'Gotham' Reveals Benedict Samuel as the Mad Hatter

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Image via Fox

The above image of Benedict Samuel as the Mad Hatter, who will first appear in the third episode of Season 3 of Gotham but will be a season regular, comes courtesy of EW. Also known as Jervis Tetch, the Mad Hatter is described as “a talented hypnotist teetering on the edge of madness. He arrives in Gotham with an unwavering desire to find his sister, Alice, a young woman who went missing in the city years ago. It is anyone’s guess just how far down the rabbit hole he’s willing to go in order to find her.”

Let us know what you think of his appearance/description/casting in the comments!

'Legends of Tomorrow' Casts Sarah Grey as Stargirl

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Image via DC Comics

Speaking of casting, IGN reports that Legends of Tomorrrow has found its Stargirl in the person of Sarah Grey (Wayward Pines). Grey, who also appears in the upcoming Power Rangers movie, will take on the role of Courtney Whitmore, a.k.a. Stargirl, a creation of Geoff Johns, as a tribute to his late sister, who first appeared in "Stars and S.T.R.I.P.E." #0 in 1999. She's a member of the Justice Society of America, which will feature prominently in this season, and wields the Cosmic Staff, which allows her the ability to fly and manipulate energy.

Grey will join new additions Hourman (Patrick J. Adams), Amaya Jiwe/Vixen (Maisie Richardson-Sellers), Henry Heywood, Sr./Commander Steel (Matthew MacCaull) and his "grandson" Dr. Nate Heywood (Nick Zano), a.k.a Citizen Steel. Dr. Mid-Nite and Obsidian will also appear but have yet to be cast.

Maisie Richardson-Sellers Roars as Vixen in 'Legends of Tomorrow' Poster

Speaking of Richardson-Sellers as Vixen, producer Marc Guggenheim shared the first image of the new take on the character and the new actor playing her:

[EMBED_TWITTER]https://twitter.com/mguggenheim/status/763767521006661633[/EMBED_TWITTER]