The Arrow-verse shows on Earth-1 aren't the only ones introducing a bunch of good guys and bad guys. Supergirl will go in some new directions for the next season, and some characters will force change. Some of that change will be positive while other change will undoubtedly be negative. Let's start with one of the good new characters!
A new superhero is joining the Supergirl team in the form of Nia Nal, a.k.a. Dreamer. She'll be the first transgender hero on television, and she'll actually get a start not entirely unlike Kara back in the early days of the show. Actress Nicole Maines landed the exciting role, and she spoke about her character at the Supergirl panel at San Diego Comic-Con, saying this:
This new character will come in with a connection to the absent Cat Grant, who has been working as Press Secretary for President Lynda Carter -- that is, President Olivia Marsdin -- in Washington D.C. Kara will likely already want to take Nia under her wing due to the connection to her old mentor, and it sounds like Nia will bring some of the innocently sunny optimism that Kara has lost over the years. She could be the perfect addition to the show that may get much darker in Season 4. Speaking of which, we have...
Although his name makes him sound like somebody who would totally fit with Kara "Truth, Justice, and the American way" Danvers, Agent Liberty is not somebody who any of the good guys will be able to count as a friend in Season 4. Played by Sam Witwer of Smallville fame, Agent Liberty will lead a hate group dedicated to promoting a humans-first way of life on Earth, which means bad things for aliens like Kara, J'onn J'onzz, and potentially even the President of the United States. Katie McGrath, who plays Lena Luthor on Supergirl, had this to say at San Diego Comic-Con about why Agent Liberty is a great villain:
The trailer gives the impression that Agent Liberty could do as much damage with his inciting words as some of the more violent villains in seasons past. Hopefully Nia will be able to lend a hand to Kara and Co. when dealing with this new threat!
April Parker-Jones of If Loving You Is Wrong and The Last Ship landed the role of military woman Colonel Haley. This character is devoted to the military and has the utmost respect for the chain of command, operating on what her superior officers ask of her. It sounds like Haley could turn out to be a key ally to Kara and Co. in Season 3... as long as Kara and Co.'s interests align with those of Haley's commanding offers. April Parker-Jones is on board as a regular for Season 4, so you should see a fair amount of her.
DC Comics fans may know the name "Manchester Black," as there's a memorable character of the same name in DC lore. Supergirl's Manchester Black won't be a carbon copy of his comic counterpart. Played by David Ajala of Falling Water and Jupiter Ascending, Manchester Black brings a violent mission that requires a certain degree of ruthlessness. He tries to hide his darkness with humor and charm, and he is able to escape seemingly impossible situations as the victor. David Ajala will recur throughout Season 4, so we can count on Manchester Black in more than just a standalone episoe.
Mercy And Otis Graves
An iconic comic character is coming to Supergirl. Mercy Graves is known in DC lore for her role as Lex Luthor's longtime bodyguard. Lex has been locked up in prison from the very beginning of Supergirl, with his only appearance coming via flashback. Mercy will play a different role on the show. With Rhona Mitra of The Strain and The Last Ship bringing her to life on the small screen, Supergirl's Mercy will be a former CADMUS agent whose belief in human exceptionalism is longstanding. Without either Lex or Lillian Luthor to guard, Mercy becomes a prime figure in the human-first moment in National City, which likely means that she'll be an ally to Agent Liberty.
Mercy will be joined by her brother Otis, played by Robert Baker of Grey's Anatomy and Santa Clarita Diet. Otis isn't the sharpest tool in the box, but he's an expert in assassinating aliens. Unlike Mercy, Otis is not a character to appear in DC Comics. Mercy will likely be the major player of the two siblings. Still, the good guys and aliens of National City won't want to turn their back on Otis.
Vice President Baker
Supergirl is bringing in an icon of sci-fi to play the Vice President of the United States. Brent Spiner, best known for his work as Data in the Star Trek franchise, signed on to place VP Baker on a recurring basis in Season 4. Baker is considered an unlikely leader, although he has political savvy and intelligence to spare. He'll need to rise to the occasion and step up as a leader.
What's not clear at this time is what happened to President Marsdin that Baker must suddenly take a more active role in the government. Could Agent Liberty and Mercy Graves figure out that President Marsdin is actually an alien? Or will Marsdin's staunch beliefs about the importance of alien equality on Earth lose her supporters in certain demographics? We'll have to wait and see.
Stay tuned to CinemaBlend for the latest in superhero TV news. For what you need to know to tune in to the Arrow-verse shows in the not-too-distant future, take a look at The CW's fall TV premiere schedule. For some non-superhero options, swing by our fall TV guide.