Taylor Kitsch as Lieutenant Alex Hopper

Alexander Skarsgård as Commander Stone Hopper

Rihanna as Petty Officer Cora 'Weps' Raikes

Brooklyn Decker as Sam

Tadanobu Asano as Captain Yugi Nagata

Hamish Linklater as Cal Zapata

Liam Neeson as Admiral Shane

Peter MacNicol as Secretary of Defense

John Tui as Chief Petty Officer Walter "The Beast" Lynch

Jesse Plemons as Boatswain Mate Seaman Jimmy "Ordy" Ord

Gregory D. Gadson as Lieutenant Colonel Mick Canales

Jerry Ferrara as Sampson JOOD Strodell

Adam Godley as Dr. Nogrady

Rico McClinton as Captain Browley

Joji Yoshida as Chief Engineer Hiroki

Louis Lombardi as Bartender

Norman Vincent McLafferty as Old Salt

Stephen Bishop as JPJ OOD

Dante Jimenez as JPJ XO Mullenaro

Daven Arce as JPJ Helmsman

Ralph Richardson as JPJ Starboard Gunner

Biunca Love as JPJ BMOW

Michael Sherman as JPJ JOOD

Austin Naulty as JPJ Fireman

Patricia Brown as JPJ Fireman

Gregory Harvey as JPJ Fireman

Sebastian James as JPJ Scat

Andrew Serpas as JPJ Armorer

Damien Seanard Parker as JPJ Helibay Sailor

Carson Aune as CIC Gunner

Doug Penty as CIC Watch Supervisor

Josh Pence as Combat Systems Coordinator

Jason Henderson as Radar System Controller

Brint Terrell as Chart Table Plotter

Brad Faucheux as Chart Table Log Keeper

Dustin J. Reno as Electronic Warfare Supervisor

John Schmotzer as CIC Watch Officer

Peter Berg as JPJ 2nd Gunner

Jonathon Groves as JPJ Port Gunner

Lloyd Pitts as JPJ Port Gunner

Ryan Tinio as JPJ Radar Op

Allie Sillah as JPJ Lead Helmsman

Johnny Santiago as JPJ Switchboard Operator

Kiley Margeson as Gun Console Operator

Jeffrey Johns as Surface Warfare Coordinator

Esther Solomon as JPJ CIWS Operator

Kevin Garlington as JPJ Air Warfare Coordinator

Anthony Czumalowski as JPJ Sailor

James Hadde as JPJ Sailor

Pat Lancaster as JPJ Sailor

Jordan Kirkwood as JPJ Sailor

Jane Dubiel as JPJ Sailor

John A. Weaver as JPJ Sailor

Mark J. Lindquist as JPJ Sailor

Phil Neilson as JPJ Sailor

Dane Justman as Sampson OOD

Dustin Watchman as Sampson Helmsman

Drew Rausch as Sampson XO

Ryland Reamy as Sampson CIC TAO

Donald Willcutt as Sampson Starboard Lookout

Eli Miranda as Sampson Boatswain

Josh Demuth as Sampson Port Lookout

Thomas Grieser as Sampson Watch Officer

Christopher Darling as Samson OS DA

Tyrone Gregg as Sampson Gunner

Brian C. Hirono as Myoko OOD

Yutaka Takeuchi as Myoko XO

Nobuharu Harada as Myoko JOOD

Masaomi Uchida as Myoko Helmsman

Kyle Ken Shimabukuro as Myoko Radar Operator

Masashi Takekawa as Myoko Starboard Lookout

Hyoe Joe Takahashi as Myoko BMOW

Rick Hoffman as Chairman, Joint Chiefs of Staff

Stephen Baldini as State Department Official

Bill Stinchcomb as Marine Commandant

Bruce Mandell as Army Chief of Staff

Gary Grubbs as Air Force Chief of Staff

David Jensen as NASA Director

Mike Meldman as Commander Meldman

Hunter Meldman as Ensign

George Arine as Japanese Vice Admiral

Bill McMullen as JPL Supervisor

Joe Chrest as JPL Controller

Benjamin Lloyd as Officer Blake

Billy Slaughter as BIP Technician

Griff Furst as BIP HQ Controller #2

Terri Battee as BIP Journalist

Angelo Denova as BIP Journalist

Colby Parker, Jr. as BIP Scientist

Geoff Clayton as BIP Scientist

David Kors as BIP Scientist

Christopher McGahan as Cal's Jr. Tech

Kerry Cahill as Cal's Female Colleague

Liz Wicker as Female Newscaster

Michelle Arthur as British Newscaster

Natalia Castellanos as Spanish Newscaster

Dan Cooke as Hawaiian Newscaster

Leni Ito as Japanese Newscaster

Jay Jackson as American Newscaster

Jackie Johnson as Jackie Johnson

Frank J. Doyle as Soccer Ref

Robin Atkin Downes as Soccer Announcer

Zach Selwyn as Soccer Announcer

Leonard Rogers as Japanese Goalie

Citizen Cope as Singer at Bar

Evan Bernard as Fat Guy at Bar

Cora Yamagata as Convenience Store Owner

Frank Cassavetes as Grizzled Gunner

Thomas McCurdy as Admiral Shane's Aide

Robert Hotalen as Marine Aide

Rami Malek as Watch Officer

Ray Mabus as Reagan CO

Marissa Nordhelm as Reagan Radar Operator

Ronald Chavez as Commander Rivera

Legrand Strickland as Wounded Warrior

Michael Vernon as CAREN Technician

Jason Wilken as Director of Rehabilitation

James Ward as Old Salt

Philip Trifilo as Old Salt

William Powers as Old Salt

Don Dailey as Old Salt

Bill Carr as Old Salt

Dennis M. Keating as Old Salt

Garrett Lynch as Old Salt

Wallace Mackensen as Old Salt

William Long as Old Salt

Edward Drew as Old Salt TAO

John E. Culkin as Old Salt RO

Hiram L. Fong as Old Salt Navigator

Larry Wegger as Old Salt WO

Dallas Kane Hewitt as POFC Dallas

Adam Sibley as SCAT Team

James Rish as SCAT Team

George O'Hanlon, Jr. as Tourist Guide

Wesley Phelps as Tourist Kid

Marcus Lyle Brown as Regent Land Commander

Kyle Clements as Regent Sea Commander

Kevin P. Kearns as Jimmy

John Bell as Angus

Conor McCarry as Ronnie

Dylan Gillooly as Thom

Gerardo Celasco as Ensign Chavez

Teresa Alvarez as Reporter (uncredited)

Luing Andrews as Admiral Jack (uncredited)

Joanne Bahris as Woman at Soccer Game (uncredited)

Tim Blanchard as Regent (uncredited)

Raj K. Bose as Singaporean Captain (uncredited)

Curtis Bush as Naval Officer (uncredited)

Tom Cain as Three Star Admiral (uncredited)

Edward J. Clare as Scientist (uncredited)

Davo Coria as Little League Father (uncredited)

Kamakani De Dely as Chief Petty Officer (uncredited)

Alex DeMarco as CIC Sailor (uncredited)

Paul Edney as U.S. Navy Captain (uncredited)

Joanna Ellenbeck as Petty Officer 3rd Class Blackburn (uncredited)

Kerry-Ann Ellington as Navy Wife (uncredited)

Kasey Emas as Bar Patron (uncredited)

Faith Fay as Harrison (uncredited)

Gregory Allen Gabroy as Ensign Huyn (uncredited)

Jaq Galliano as Alien Regent / Thug (uncredited)

Mickey Graue as Baseball Kid (uncredited)

Christopher Lee Herod as Marine (uncredited)

Dakota Hill as Gunner's Mate Wagner (uncredited)

Sean Douglas Hoban as U.S. Navy Sailor (uncredited)

Bliss Kelley as Soccer Fan (uncredited)

Kennon Kepper as Kid in Car (uncredited)

Kristal Kincaid as Soccer Game Patron (uncredited)

James Koons as Petty Officer (uncredited)

Anthony A. Kung as Japanese Soccer Player (uncredited)

Tony Lawson as Reporter (uncredited)

Wes Martinez as International Anchor (uncredited)

Ed Moy as Japanese Sailor (uncredited)

Arlene Newman as Naval Officer

Adam J. Reeb as Petty Officer 3rd Class (uncredited)

Jane Runnalls as Naval Officer (uncredited)

Ben Skorstad as Camera Ship Pilot (uncredited)

Barbara L. Southern as Admiral's Wife (uncredited)

Kristen StephensonPino as Hot Chick (uncredited)

Kelly R. Thomas as Alien Ground Commander (uncredited)

Joseph Wilson as Alien Regent Scientist / MO CAP (uncredited)

Michael Wozniak as Journalist (uncredited)

Elvin Yoshida as Myoko Officer (uncredited)

Barack Obama as Self (uncredited)