u/NiftyXL_355

Kyle Chandler as Hal Jordan
Jon Hamm as Bruce Wayne
Brendan Fraser as Kal-El
Penelope Cruz or Rachel Weisz as Diana of Themyiscara(couldn't choose between them)
Patrick Wilson as Barry Allen
Ethan Hawke as Oliver Queen
Elizabeth Banks as Dinah Lance
Nikolaj Coster-Waldau as Arthur Curry
Mahershala Ali as J'onn J'onzz
Owen Wilson as Michael John Carter
Winona Ryder as Zatanna Zatara
Jason Sudeikis as Ted Kord
Aisha Tyler as Mari McCabe
Ty Burrell as Patrick O'Brian
Charlize Theron as Kara Zor-El
Vincent D'Onofrio as Alec Holland/Swamp Thing

Chris Evans
Mark Ruffalo
Scarlett Johansson
Chris Hemsworth
Jeremy Renner

Zendaya
Tom Holland
Mia Goth
Timothee Chalamet
Florence Pugh
Skyler Gisondo
Anya Taylor-Joy
George MacKay
Saoirse Ronan
Paul Mescal
Jodie Comer

David Corenswet as Scott Summers
Rachel Brosnahan as Carol Danvers
Nicholas Hoult as Hank Pym
Edi Gathegi as Reverend Achebe
Skyler Gisondo as Bobby Drake
Nathan Fillion as Simon Williams
Isabela Merced as Anya Corazon
Aaron Pierre as Eric Brooks
Kyle Chandler as George Stacy
John Cena as William Baker
Jennifer Holland as Phyla-Vell
Milly Alcock as Gwen Stacy
Jason Momoa as Victor Creed
Tom Rhys Harries as Norrin Radd
Naomi Ackie as Mercedes Knight
Xolo Mariduena as Sam Alexander

Jeremy Strong as Rorschach
Alexander Skarsgard as Dr Manhattan
Tony Dalton as The Comedian
Kit Harington as Nite Owl II
Evan Rachel Wood as Silk Spectre II
Andrew Garfield as Ozymandias
John Malkovich as Moloch the Mystic
William H. Macy as Nite Owl I
Diane Kruger as Silk Spectre I
Josh Brolin as Richard Nixon

Rules:

Comment with the most upvotes wins.

You can pick any performance.

Comment separately for Actress and Actor.

Jacobi Jupe, Hamnet
Tatum O'Neal, Paper Moon
Natalie Portman, Leon
Jacob Tremblay, Wonder
Anna Paquin, Piano
Ana Torrent, The Spirit of the Beehive

Daniel Craig as Professor X
Jason Isaacs as Magneto
Jonathan Bailey as Cyclops
Ana De Armas as Marvel Girl
Rege Jean Page as Angel
Nicholas Galitzine as Iceman
Sam Richardson as Beast
Matt Wood as Wolverine
Jodie Turner-Smith as Storm
Austin Butler as Gambit
Lily James as Rogue
Louis Hoffman as Nightcrawler
Kira Kosarin as Shadowcat
Lana Condor as Jubilee

Jamie Flatters(26)(The Avatar Franchjse)

Josh Heuston(29)(Off Campus, Thor: Love and Thunder)

Rish Shah(28)(Ms. Marvel, Do Revenge)

Leo Howard(29)(Kickin' It, Days of our Lives)

Sebastian Amoruso(26)(Avatar: The Last Airbender, I Know What You Did Last Summer)

Ewan McGregor and Ella Purnell
Michael Fassbender and Francesca Capaldi
Ethan Hawke and Maya Hawke
Chiwetel Ejiofor and Chase Infiniti
Joel Edgerton and Thomasin McKenzie
Idris Elba and Yara Shahidi
Wagner Moura and Ruby Cruz
Matthew Lillard and Katie Douglas
Nick Offerman and Elle Fanning

Naomi Watts, Mulholland Drive
Marianne Jean-Baptiste, Hard Truths
Isabelle Huppert, The Piano Teacher
Jake Gyllenhaal, Nightcrawler
Ray Liotta, Goodfellas
John Goodman, The Big Lebowski
Lily Gladstone, Certain Women
Toni Collette, Hereditary
Anthony Perkins, Psycho
Henry Fonda, 12 Angry Men

Colman Domingo as Kelvin Harrison Jr
Cillian Murphy and Paul Mescal
Matthew McConaughey and Timothee Chalamet
Michael C. Hall and Patrick Gibson
Jason Isaacs and Patrick Schwarzenegger
Sterling K. Brown and Justice Smith
Michael Shannon and Joe Keery
Javier Bardem and Aron Piper
Lee Byung Hun and Charles Melton

Jared Keeso as Wolverine
Dafne Keen as X-23
Ryan Hurst as Sabertooth
Josh Hartnett as Donald Pierce
Simon Pegg as Abraham Cornelius

Maria Gabriela de Faria as Engineer
Suki Waterhouse as Jenny Sparks
Matt Bomer as Apollo
Luke Evans as Midnighter
Daniel Kaluuya as Jack Hawksmoor
Stephanie Hsu as Swift
Isabela Merced as Hawkgirl
Marwan Kenzari as The Doctor
Dan Stevens as Manchester Black(I know he isn't traditionally part of the Authority but there were rumors he would be involved in the project)

Kyle Chandler as Hal Jordan/Green Lantern
Timothy Olyphant as Jay Garrick/The Flash
Sylvestor Stallone as Ted Grant/Wildcat
Daniel Craig as Kent Nelson/Dr Fate
Jodie Foster as Dinah Drake/Black Canary
Hugo Weaving as Wesley Dodds/Sandman
Alexander Skarsgard as Carter Hall/Hawkman
Tasya Teles as Shayera Hol/Hawkgirl
Bruce Campbell as Rex Tyler/Hourman
Andrew Lincoln as Jim Corrigan/The Spectre
Scott Caan as Al Pratt/The Atom

Glenn Howerton as Joker
Leslie Odom Jr as Two-Face
Stephen Graham as Penguin
Jonathan Groff as Riddler
Anna Sawai as Catwoman
Harry Melling as Scarecrow
Edgar Ramirez as Bane
Jodie Comer as Poison Ivy
Laurence Fishburne as Mr. Freeze
Ghassan Massoud as R'as Al Ghul
May Calamawy as Talia Al Ghul
Andrew Scott as Hugo Strange
Walton Goggins as Black Mask
Taron Egerton as Victor Zsasz
Mia Goth as Harley Quinn