Justified) will recur as Dante Wallace, the "quietly powerful" leader of the Mountain Men.
John Barrowman is now a series regular, as Malcolm Merlyn aka Dark Archer.
Brandon Routh (Superman Returns) will recur as Ray Palmer aka The Atom (and a possible love interest for Felicity).
Karl Yune (Real Steel) will recur as Maseo Yamashiro, who will be introduced in flashbacks as Oliver\'s handler and, over time, teacher and friend.
Rila Fukushima (The Wolverine) will recur as Tatsu Yamashiro -- aka Katana -- a martial arts expert (and Maseo\'s wife).
J.R. Ramirez (Emily Owens MD) will recur as Ted "Wildcat" Grant, an ex-boxer who runs a gym for underprivileged youth in Starling City.
Austin Butler (The Carrie Diaries) will recur as Chase, a charismatic DJ whose talent and wiles will catch the attention of Oliver\'s kid sister Thea.
Matt Nable (Riddick) will recur as the DC Comics villain Ra\'s al Ghul, leader of the League of Assassins and father to Nyssa al Ghul.
Series regular Susanna Thompson, who plays Moira Queen, was written out of the show in the April 23 episode.
Amir Arison, who plays FBI techie Aram Mojtabai, has been promoted to series regular for Season 2.
Series regular Parminder Nagra, who plays Meera, made her final appearance in the Season 1 finale.
Mozhan Marnò (House of Cards) has been added as a series regular, playing Tamar Katzman, a former Mossad agent and incredibly intuitive spy.
Paul Reubens (Pushing Daisies) will recur as Mr. Vargas, a "muscle" who handles delicate situations in the criminal world.
Mary-Louise Parker (Weeds) will recur as Naomi Hyland, a woman keeping a secret from her husband and who is "completely tied to Reddington." Lee Tergesen (The Americans) will recur as Naomi Hyland\'s husband Frank.
Holt McCallany (Lights Out) will return/recur as Robert McCoy, the new interim D.A. (and Erin\'s potential love interest).
Bill Irwin (CSI) will recur as Cardinal Brennan, an Archbishop of the New York Diocese.
LaTanya Richardson Jackson (Broadway\'s A Raisin in the Sun) will recur as new squad commander Lt. Dee Ann Carver.
Matt Letscher (Scandal) will recur as wealthy, politically connected businessman Joseph Kennedy.
Travis Tope will recur during the fifth and final season as Slim, a young drifter who comes to Atlantic City to work for Mickey Doyle.
John Boyd (24) will recur as James Aubrey, a junior FBI agent working under Booth.
Eva Longoria (Desperate Housewives) will appear in three episodes as Sophia, a defense attorney who catches Jake\'s eye.
Kyra Sedgwick (The Closer) will appear in two episodes as Deputy Chief Madeline Wuntch, Captain Holt\'s longtime rival.
Serinda Swan (Graceland) will appear in four episodes as Brittany Baker, a graphic designer/possible romantic interest for Severide.
Archie Kao, who plays Jin, last appeared in the Season 1 finale.
Jeanne Tripplehorn last appeared in the May finale, as Alex Blake reconsidered her future with the FBI.
Jennifer Love Hewitt (The Client List) is a new series regular, playing Kate Callahan, a seasoned undercover agent whose stellar work at the FBI has landed her a coveted position with the Behavioral Analysis Unit.
Original cast member Paul Guilfoyle last appeared in the May 7 finale, as Capt. Brass reconsidered his priorities and future with CSI.
Mark Valley (Human Target) will recur as a former detective/current P.I. who teams with Elisabeth Shue\'s Finlay.
Ophelia Lovibond (Titanic: Blood and Steel) will recur as Kitty Winter, Sherlock\'s new protégé and a rival to her predecessor, Joan.
Raza Jaffrey (Smash) will recur as Joan\'s new boyfriend.
David Hyde Pierce (Frasier) will recur as a cable news legal commentator who decides to run for office.
Connie Nielsen (The Following) will recur as Ramona, an attorney with far-reaching Cook County connections.
Steven Pasquale (Rescue Me) will recur as a campaign expert courted by Eli to manage Alicia\'s possible run for state\'s attorney.
Original cast member Josh Charles made his final appearance on March 30, but already has returned to direct the occasional episode.
Original cast member Sandra Oh made her final appearance as Cristina in the Season 10 finale.
Geena Davis (Commander in Chief) will recur as a surgeon working at Grey Sloan Memorial Hospital.
Caterina Scorsone (Private Practice) is now a series regular, as Derek\'s sister Dr. Amelia Shepherd.
Series regulars Gaius Charles and Tessa Ferrer made their final appearances in the May 15 episode, as Shane went to work for Cristina and Leah got fired.
Elizabeth Rodriguez (Orange Is the New Black) will recur as one of four FBI agents assigned to investigate Westin\'s homicide.
Laura Mennell (Alphas) will recur as a brilliant epidemiologist from the Centers for Disease Control and Prevention who fears that Haven is on the verge of a deadly viral outbreak.
Amanda Setton (The Crazy Ones) will recur as Dr. Mindy Shaw, a medical examiner who is Max\'s new trainee. (Photo c/o Twitter.com/MasiOka)
Jorge Garcia is now a series regular, as conspiracy theorist Jerry Ortega.
Michelle Borth, who joined the show during Season 1 and was a series regular since Season 3, was written out in the May 2 episode, but may return at some point to wrap up Catherine\'s storyline.
Laila Robins (Bored to Death) has been added as a series regular, playing Martha Boyd, the United States Ambassador to the Islamic Republic of Pakistan.
Raza Jaffrey (Smash) will recur as Aasar Khan, a decorated lieutenant colonel in the Pakistan intelligence service who butts heads with Carrie.
Suraj Sharma (Life of Pi) will recur as Aayan Ibrahim, a Pakistani medical student who crosses paths with Claire Danes\' Carrie Mathison.
Original cast member Damian Lewis made his final appearance as Nicholas Brody in the Season 3 finale.
Dann Florek, who originated the role of Donald Cragen on L&O: Original Flavor, last aired on Jan. 15, when the captain announced his retirement.
Peter Gallagher (Covert Affairs) will recur as Deputy Chief William Dodds, the charismatic and tough-as-nails boss who oversees all of the special victims units in New York City.
Lucy Lawless (Xena: Warrior Princess) has an important role as Isabelle Hartley, a veteran S.H.I.E.L.D agent.
Nick Blood (The Bletchley Circle) has been added as a series regular, playing mercenary Lance Hunter.
Simon Kassianides (Nikita) will recur as Bakshi, a right-hand man.
Henry Simmons (NYPD Blue) will recur as Agent Alphonso "Mac" Mackenzie, a mechanic.
Kyle MacLachlan (Twin Peaks) will recur as Skye\'s father.
Niecy Nash (Getting On) will recur as Dr. Jean Fishman, the new chief of Shulman & Associates\' admitting hospital -- and Mindy\'s rival.
Sean Hayes (Will & Grace) is a new series regular, playing Kip Withers, Carol\'s new best friend whose presence is a source of friction for Will Arnett\'s Nathan.
Rhea Perlman (Cheers) will recur as Danny\'s mother, Annette.
Allison Tolman (Fargo) will appear in two episodes as Abby Berman, a romance novelist who goes on a blind date with Peter.
Original cast member Zoe Jarman, who plays receptionist Betsy, is no longer a series regular but may guest-star during Season 3.
Andrea Anders (Better Off Ted) will recur as Amber, the matriarch of the horrible new family that moves next door to the Dunphys.
Steve Zahn (Treme) will recur as her husband Ronnie.
Mimi Kennedy is now a series regular, as Christy\'s fellow alcoholic/Bonnie\'s foil, Marjorie.
Jaime Pressly (My Name Is Earl) will recur as a newly sober (and idly wealthy) pal of Anna Faris\' Christy
Tony winner Laura Benanti (Go On) will recur as up-and-coming recording artist Sadie Stone.
Derek Hough (Dancing With the Stars) will recur as Noah West, a "beguiling and disarming" movie star who comes to Music City to film a country music biopic.
Mykelti Williamson (Justified) will appear in four episodes as Terry, a brilliant musician who, since suffering a personal tragedy, has lived a life on the streets.
Brette Taylor (Rescue Me) will recur as Pam, Luke\'s new backup singer -- and Deacon\'s eventual muse.
Alexa Vega (Tomorrow People) will appear in multiple episodes as Kiley, Gunnar\'s high school sweetheart-turned-single mother.
Stephanie Jacobsen (Melrose Place) will recur as FBI Special Agent Leia Pendergrast, Tony\'s new partner.
Alex Veadov will recur as Sergei Mishnev, a mercenary/new adversary for Gibbs\' team.
Lev Gorn (The Americans) will recur as Russian Deputy Ambassador Anton Yelic.
Kaitlin Olson (It\'s Always Sunny in Philadelphia) will recur as Ashley, Jess\' high school nemesis who is now engaged to her father Bob.
Georgina Haig (Fringe) and newcomer Elizabeth Lail will recur as Frozen characters Elsa and Anna.
Scott Michael Foster (Greek) will recur as Frozen\'s Kristoff.
Tyler Jacob Moore (Shameless) will recur as Frozen\'s Hans.
Elizabeth Mitchell (Lost) will recur as a "possibly malevolent" character with ties to Frozen sisters Elsa and Anna, as well as to Storybrooke.
Michael Socha will recur as Once Upon a Time in Wonderland\'s Will Scarlett.
At midseason, Kristin Bauer van Straten (True Blood) will reprise her role and recur as Maleficent.
Michael Raymond-James is no longer a series regular, though Neal/Bae could possibly appear in more flashbacks.
Colin Woodell (Devious Maids) will recur as Adam, a lieutenant in New Orleans\' leading werewolf pack.
Daniel Sharman (Teen Wolf) has a "major Season 2 role" as a witch named Kaleb.
Daniella Pineda (Sophie) last appeared in the Feb. 4 episode.
Claire Holt (Rebekah) will not be a series regular for Season 2, and already has landed a lead role on the midseason NBC series Aquarius.
Betsy Brandt (Breaking Bad) will return and recur as Hank\'s estranged wife Sandy.
Cara Buono (Mad Men) will recur as Martine, a femme fatale uniquely qualified to navigate Season 4\'s "new world order."
Monique Curnen (Lie to Me) will recur as Captain Felicia Moreno, Fusco\'s latest boss at the 8th precinct.
Jonathan Keltz has been promoted to series regular for Season 2, as baker-turned-land owner Leith.
Alan Van Sprang, who plays King Henry, made his final appearance in the Season 1 finale.
Craig Parker (Legend of the Seeker) will recur as Narcisse, a "brilliant, sexual [and] fierce" Catholic with a "death grip" on French Court.
Michelle Fairley (Game of Thrones) will recur as Margaret Langston, the returned, "formidable" matriarch of the Langston family.
James Tupper is now a series regular, as David Clarke.
Elena Satine (Agents of S.H.I.E.L.D.) will recur as Louise, the "black sheep" daughter of a wealthy Southern family.
Brian Hallisay (The Client List) will recur as Ben, a new friend of Jack\'s and a local cop.
Nestor Serrano (Graceland) will recur as police chief Edward Alvarez, Victoria\'s new ally.
Barry Sloane , a series regular since early Season 2, last appeared in Season 3 finale.
) will recur as "a very formidable person," says Shonda Rhimes.
Sonya Walger (Lost) will potentially recur as [REDACTED].
Original cast member Columbus Short will not be returning for Season 4, as Harrison.
John Noble (Fringe) is now a series regular, as Henry (aka Jeremy aka the Horseman of War).
Lyndie Greenwood is now a series regular, as Abbie\'s sister Jenny.
Heather Lind (TURN) will appear in multiple episodes as Mary Wells, an old flame of Ichabod\'s from England.
Matt Barr (Hellcats) will recur in Season 2 as Nick Hawley, a "ruggedly handsome" bounty hunter who\'ll assist Ichabod and Abbie on a supernatural case.
Sakina Jaffrey (House of Cards) will recur as Leena Reyes, a former border-patrol officer who will assume the duties of the incarcerated Sheriff Irving.
ANnabeth Gish (The Bridge) will recur as Charming\'s smart and edgy new sheriff, Althea Jarry.
Rocker Courtney Love has a "pivotal, multi-episode arc" as Ms. Harrison, the straight-shooting preschool teacher of Jax\'s eldest son, Abel.
Mathew St. Patrick (Six Feet Under) will recur as Moses, the head of a security team.
Mark Sheppard, who has recurred as Crowley since Season 5, was promoted to series regular for Season 10.
Maggie Lawson (Psych) will recur during the final season as a social worker who assists Walden and Alan in their bid to get married so that Alan can adopt a child.
Michael Malarkey is now a series regular, as the vampire Enzo/Damon\'s frenemy.
Colin Ferguson (Eureka,) will recur as Tripp, the head of a community militia who will "do anything to protect his town."
Marco James (The Client List) will recur as Liam, a "cocky yet good-natured" med student at Whitmore College.
Emily C. Chang (Days of Our Lives) will recur as the sweet and sincere Ivy, who is the "the quintessential girl next door with an unexpected wild side."
Gabrielle Walsh (Paranormal Activity: The Marked Ones) will recur as Sarah, who comes to Mystic Falls with "spunk, street smarts and a shady agenda."
Jayson Warner Smith (Rectify) will appear in multiple episodes as the owner of a high-end hot rod shop.
Matt Davis, who resurfaced as Alaric in the May finale, has returned for Season 6 as a series regular.
Seth Gilliam (The Wire, Oz) has been added as a series regular, playing a mystery character with "two sides -- one full of friendly, puckish humor, and one haunted by a dark secret."
Raymond J. Barry (Justified) will recur as Dante Wallace, the "quietly powerful" leader of the Mountain Men.