Battlestar Galactica star Katee Sackhoff will star in The Flash season 4 as Amunet Black.
Julian McMahon has signed on for the pivotal role of Jonah in the highly-anticipated Hulu series Marvels' The Runaways, debuting this fall.
Fox is bringing back Robbie Amell and Lauren Ambrose as FBI agents Miller and Einstein in X-Files Season 11, with Barbara Hershey also coming aboard.
The CW has brought on Marvin 'Krondon' James III to play the DC Comics villain Black Whale in the new CW series Black Lightning.
Maya Rudolph has come aboard to play the mother of nine-year-old Ralphie Parker in Fox's live musical adaptation of A Christmas Story.
Teagan Croft has become the first cast member to sign on for DC's new live-action Teen Titans series entitled Titans, playing Raven.
Wonder Woman star Chris Pine reunites with his director Patty Jenkins for new straight-to-series TNT show One Day She'll Darken.
HBO is getting close to officially green lighting True Detective Season 3 as the network sets out to secure episode directors.
Netflix has ordered 20 episodes of a new animated fantasy comedy series called Disenchantment, from The Simpsons creator Matt Groening.
Lucifer season 3 gets Tom Welling as 'Marcus Pierce' an accomplished police lieutenant who is everything Lucifer is not.
Series creator Ryan Murphy announces on social media that Girls creator Lena Dunham is joining the cast of American Horror Story Season 7.
Mitch Pileggi has finalized his deal to return as Mulder and Scully's boss Walter Skinner in The X-Files Season 11.
IT star Bill Skarsgard takes on a much different role in the Stephen King anthology series Castle Rock.
Smallville star Erica Durance has come aboard to play Alura Zor-El, as Laura Benanti is forced to depart due to her Broadway obligations.
Marvel has brought on Mustafa Shakir to play John McIver, while Gabrielle Dennis will play Tilda Johnson in Luke Cage Season 2.
HBO is slowly creeping towards True Detective Season 3 and has a leading man in its sights.
Melanie Lynskey has signed on as the female lead in Hulu's new Stephen King TV series Castle Rock alongside Andre Holland.
Hamilton creator Lin-Manuel Miranda has come aboard to voice the iconic Gizmoduck in Disney XD's all new DuckTales TV show.
Once Upon a Time star Jennifer Morrison has decided to leave the hit fantasy series for creative and personal reasons.
Will Chase will play a new father arriving from California in the upcoming season of Stranger Things.
Shazad Latif, Rekha Sharma, Kenneth Mitchell, Clare McConnell and Damon Runyan have joined the cast of Star Trek Discovery.
CBS All-Access has confirmed Sonequa Martin-Green's casting in Star Trek Discovery, while adding Rainn Wilson as the iconic Harry Mudd.
Katie Cassidy will return as a series regular in Arrow Season 6 after appearing in the last two Season 5 episodes as Black Siren.
Jon Favreau has come aboard to direct the pilot for CBS' Big Bang Theory spin-off Young Sheldon, which has been given a series order.
Sarah Bolger has signed on to play Emily, the childhood sweetheart of EZ in the Sons of Anarchy spin-off Mayans MC.
Former Harry Potter star Jason Isaacs is going to boldly go to the world of sci-fi as he will be playing the new captain in Star Trek: Discovery.
Lost and Night Shift star Ken Leung has signed on to join the growing cast of Marvel's Inhumans as Black Bolt's confidant, Karnak.
Zoe Perry will play the younger version of her real-life mom Lauri Metcalf's Big Bang character in the Sheldon spin-off.
ABC's Inhumans TV show keeps adding to its growing cast, bringing on Serinda Swan to play Medusa, Queen of the Atillan.
Hell on Wheels star Anson Mount has signed on to play Black Bolt in Marvel's Inhumans TV show, alongside Iwan Rheon's Maximus.
JD Pardo has signed on to play the series lead character EZ Reyes in FX's Sons of Anarchy spin-off Mayans MC.
Cress Williams has come aboard to star as the title character in The CW's DC Comics superhero series Black Lightning.
Kong: Skull Island star John Ortiz lands a leading role as the president of another Mayans chapter in the Sons of Anarchy spin-off Mayans MC.
Game of Thrones star Iwan Rheon has been cast in the lead role of Maximus in ABC's upcoming Inhumans series.
Edwards James Olmos is the first cast member to come aboard Kurt Sutter's new drama Mayans MC for FX.
Marvel has rounded out the cast for its Runaways TV series, casting 10 actors as The Pride, the evil parents of the teenage title characters.
Fox has brought on Blair Redford to play a Native American mutant named Sam in Fox's new untitled X-Men TV series.
Kevin Sorbo has come aboard to play a mysterious villain in Supergirl Season 2, while a new episode synopsis reveals when Mr. Mxyzptlk arrives.
Skyfall and Spectre actor Ben Whishaw may replace Peter Capaldi as the good Doctor in Doctor Who season 11.
Lois & Clark star Teri Hatcher has signed on for a multi-episode arc in Supergirl Season 2 as a major new villain.