| The Invaders, alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them, for him it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun. |
| Name | Character | Episodes |
|---|---|---|
| Roy Thinnes | David Vincent | 43 |
| Kent Smith | Stan Arthur | 27 |
| Kent Smith | Edgar Scoville | 12 |
| Michael Rennie | Vice Chancellor Pierre Alquist | 2 |
| William Windom | Michael Tressider | 2 |
| Diana Hyland | Ellie Markham | 2 |
| Ron Nyman | Alien (uncredited) | 2 |
| Eduard Franz | Premier Thor Halvorsen | 2 |
| Anthony Eisley | Bob Torin | 2 |
| Lin McCarthy | Col. Archie Harmon | 2 |
| Gene Hackman | Tom Jessup | 1 |
| Suzanne Pleshette | Vikki | 1 |
| Suzanne Pleshette | Anne Gibbs | 1 |
| Louis Gossett Jr. | Ollie | 1 |
| Roddy McDowall | Lloyd Lindstrom | 1 |
| Ron Hayes | Sheriff Gordon Clements | 1 |
| Morgan Jones | Reporter | 1 |
| Morgan Jones | Lt. Rawlings | 1 |
| Morgan Jones | Guard | 1 |
| George Keymas | Lavin | 1 |
| James T. Callahan | Ed Gidney | 1 |
| James T. Callahan | Dr. Harry Mills | 1 |
| Andrew Duggan | General Theodore Beaumont | 1 |
| Walter Brooke | Danvers | 1 |
| Robert Osterloh | Carl Wyeth | 1 |
| Susan Strasberg | Diane Oberly | 1 |
| Larry Ward | Detective Carter | 1 |
| Laurie Mock | Female Alien | 1 |
| James Daly | Alan Landers | 1 |
| James Daly | Gen. Samuel Arlington Concannon | 1 |
| Tim McIntire | Hal | 1 |
| Kelly Jean Peters | Nicole | 1 |
| Don Eitner | Webster | 1 |
| Murray Matheson | Dr. Reynard | 1 |
| Burgess Meredith | Theodore Booth | 1 |
| Diana Muldaur | Claire | 1 |
| Julie Sommars | Grace Vincent | 1 |
| Katherine Justice | Helen | 1 |
| Katherine Justice | Janet Garner | 1 |
| Harold Gould | Dr. Mailer | 1 |
| Harold Gould | Allen Slater | 1 |
| Kevin McCarthy | Paul Cook | 1 |
| Michael Rennie | Magnus | 1 |
| Jack Warden | Barney Cahill | 1 |
| Sally Kellerman | Laura Crowell | 1 |
| Dana Elcar | Sheriff Tom Halloway | 1 |
| Ralph Bellamy | Morgan Tate | 1 |
| Pat Hingle | Brother Avery | 1 |
| Susan Oliver | Stacy | 1 |
| Susan Oliver | Joan Seeley | 1 |
| Barbara Hershey | Beth Ferguson | 1 |
| Anne Francis | Annie Rhodes | 1 |
| Will Geer | Hank Willis | 1 |
| Jason Evers | Maj. Dan Keller | 1 |
| Carol Lynley | Elyse Reynolds | 1 |
| Barbara Barrie | Gale Frazer | 1 |
| William Windom | Major Rick Graves | 1 |
| James Gammon | Hal | 1 |
| Antoinette Bower | Laurie Keller | 1 |
| Murray Hamilton | Lewis Dunhill | 1 |
| William Boyett | Tressider's Man | 1 |
| Kevin Coughlin | Roy | 1 |
| John Milford | Sheriff Lou Carver | 1 |
| John Milford | James Boland | 1 |
| John Milford | Jim Bryce | 1 |
| Raymond St. Jacques | James A. Baxter | 1 |
| Ellen Corby | Aunt Sara | 1 |
| Ahna Capri | Joan Surrat | 1 |
| Laurence Naismith | Professor Lindstrom | 1 |
| Laurence Naismith | Cyrus Stone | 1 |
| Diane Baker | Kathy Adams | 1 |
| Hal Baylor | Guard | 1 |
| Hal Baylor | Friendly Guard | 1 |
| Wayne Rogers | Police Lt. John Mattson | 1 |
| Peter Graves | Gavin Lewis | 1 |
| John Stephenson | John Nivin | 1 |
| Shirley Knight | Margaret Cook | 1 |
| Roy Jenson | Alien | 1 |
| Dabbs Greer | The Minister | 1 |
| Barry Williams | Boy | 1 |
| BarBara Luna | Lisa | 1 |
| John Zaremba | General | 1 |
| John Zaremba | Professor Ed Harrison | 1 |
| John Randolph | Police Sgt. Ernie Goldhaver | 1 |
| Roscoe Lee Browne | Arnold Andrew Warren | 1 |
| Charles Drake | Robert Morrison | 1 |
| Karen Black | Claudia Stone | 1 |
| Fritz Weaver | Deputy Ambassador Peter Borke | 1 |
| Peggy Lipton | Bride | 1 |
| Paul Carr | Billy Stearns | 1 |
| Joanne Linville | Angela Smith | 1 |
| Joanne Linville | Prof. Pat Reed | 1 |
| John Ericson | Hardy Smith | 1 |
| Ted Knight | Alien Air Force Major McEvoy | 1 |
| Nancy Kovack | June Murray | 1 |
| Dabney Coleman | Capt. Mitchell Ross | 1 |
| Dabney Coleman | John Carter | 1 |
| William Talman | Colonel Griffith | 1 |
| Strother Martin | Charlie Coogan | 1 |
| Ford Rainey | George Grundy | 1 |
| Ford Rainey | Gen. Jonathan Blaine | 1 |
| Barry Morse | Keith | 1 |
| Dana Wynter | Dr. Katherina Serret | 1 |
| Erik Holland | MP Alien | 1 |
| Lawrence Dane | Josef Dansk | 1 |
| Douglas Henderson | Lieutenant Farley | 1 |
| Douglas Henderson | Martin | 1 |
| Mort Mills | Mr. Arius | 1 |
| Bill Erwin | Manager | 1 |
| Arthur Hill | Warren Doneghan | 1 |
| Seymour Cassel | Driver | 1 |
| John Larch | Greg Lucather | 1 |
| Larry Gates | Weller | 1 |
| Ian Wolfe | Secretary Knute Rosmundson | 1 |
| Russell Thorson | Sheriff | 1 |
| Patricia Smith | Edna Greely | 1 |
| Patricia Smith | Sally Palay | 1 |
| Ed Peck | Darrow | 1 |
| Robert Walker Jr. | Nick Baxter | 1 |
| Charles Aidman | Prof. Julian Reed | 1 |
| Mary Jackson | Nurse | 1 |
| Mary Jackson | Hattie Willis | 1 |
| Marlyn Mason | Carol Tate | 1 |
| Barney Phillips | Walt Anson | 1 |
| Barney Phillips | Emmett Morgen | 1 |
| Harlan Warde | Ed Peterson | 1 |
| R.G. Armstrong | Gus Flagg | 1 |
| R.G. Armstrong | Police Capt. Bill Battersea | 1 |
| Donald Harron | Jeff Brower | 1 |
| David Sheiner | Mr. Burns | 1 |
| Paul Mantee | Deputy Vern Hammond | 1 |
| Wesley Addy | Tomkins | 1 |
| Peter Brocco | Millington | 1 |
| John Harmon | Cook | 1 |
| Val Avery | Manager | 1 |
| Malcolm Atterbury | Judge Simonson | 1 |
| Richard Anderson | Blake | 1 |
| J.D. Cannon | Police Lt. Ben Holman | 1 |
| J.D. Cannon | Peter Kalter | 1 |
| Ed Asner | Taugus | 1 |
| Ed Asner | Harry Ferguson | 1 |
| Paul Gleason | Alien | 1 |
| Jeanette Nolan | Miss Havergill | 1 |
| Andrew Prine | Vern Corbett | 1 |
| Jack Lord | George Vikor | 1 |
| Ed Begley | Simon Carver | 1 |
| Ed Begley | Dr. Samuel Crowell | 1 |
| Diana Hyland | Sherri Vikor | 1 |
| Don Dubbins | Wesley J. Sanders | 1 |
| John Carter | Owens | 1 |
| John Lupton | Maj. Clifford Banks | 1 |
| Tom Lowell | Steve | 1 |
| Judee Morton | Mavis | 1 |
| Whit Bissell | Col. Harris | 1 |
| Alfred Ryder | Mr. Nexus | 1 |
| Alfred Ryder | Ryder (Invader Leader) | 1 |
| Don Ross | Ed Larson | 1 |
| Don Ross | Reporter | 1 |
| Vaughn Taylor | Kemper | 1 |
| Nan Martin | Dr. Maria McKinley | 1 |
| Edward Faulkner | Alien | 1 |
| Wright King | Ed Tonkin | 1 |
| Soon-Tek Oh | Houseboy | 1 |
| Skip Ward | Man | 1 |
| Skip Ward | Man / John Brandon | 1 |
| Joseph V. Perry | Joe Bagely | 1 |
| Milton Selzer | A.J. Richards | 1 |
| John McLiam | Hotel Clerk | 1 |
| Ron Nyman | Townsman (uncredited) | 1 |
| Ron Nyman | Bartender / Alien (uncredited) | 1 |
| Hal Taggart | Alien (uncredited) | 1 |
| Hal Taggart | Pedestrian (uncredited) | 1 |
| Hal Taggart | Juror (uncredited) | 1 |
| Arthur Franz | Capt. Jim Trent | 1 |
| James Whitmore | Harry Swain | 1 |
| Noam Pitlik | Jerry Burns | 1 |
| Joseph Campanella | Father Joe | 1 |
| Walter Woolf King | Head Alien | 1 |
| Paul Bryar | J.O. Brock | 1 |
| John S. Ragin | John Finney | 1 |
| John S. Ragin | Kant | 1 |
| William Smithers | Nat Greely | 1 |
| William Smithers | Adam Lane | 1 |
| Willard Sage | Lieutenant James | 1 |
| Phillip Pine | Sgt. Hal Corman | 1 |
| Richard Hale | Fred Wilk Sr. | 1 |
| Walter Reed | Major | 1 |
| Michael Constantine | Dr. Martin Willard | 1 |
| Don Gordon | Charlie Gilman | 1 |
| Frank Overton | Dr. Grayson | 1 |
| E.J. André | Dr. Henry Thorne | 1 |
| Helen Kleeb | Mollly | 1 |
| Lynn Loring | Madeline Flagg | 1 |
| Gene Lyons | Sawyer | 1 |
| Gene Lyons | John Corwin | 1 |
| Zina Bethune | Sister Claire | 1 |
| Albert Carrier | Frenchman | 1 |
| Max Kleven | Guard | 1 |
| Ben Wright | Emissary | 1 |
| Ross Elliott | McNally | 1 |
| Ross Elliott | Prof. Eliot Kramer | 1 |
| Eddie Barth | Cab Driver | 1 |
| Edward Andrews | Evans | 1 |
| Carey Loftin | Hank Braden | 1 |
| Victor Brandt | Joey Taft | 1 |
| Robert H. Harris | Hastings | 1 |
| Robert H. Harris | Dr. Stanley Frederickson | 1 |
| Ted Gehring | Cab Driver | 1 |
| Janet MacLachlan | Celia Baxter | 1 |
| Bill Zuckert | Sgt. Bert Wisnovsky | 1 |
| Harry Townes | Will Hale | 1 |
| Michael Tolan | Dr. Ted Willard | 1 |
| Leonard Stone | Ramsey | 1 |
| Anthony Eisley | Tony LaCava | 1 |
| Vic Perrin | Hypnotist Alien | 1 |
| Jon Lormer | Minister | 1 |
| James Seay | Grayson | 1 |
| Russell Johnson | James Bernard | 1 |
| Marcia Wallace | Courtroom Spectator (uncredited) | 1 |
| Lynda Day George | Janet Wilk | 1 |
| Rhys Williams | Professor Hellman | 1 |
| Peter Mark Richman | Tom Wiley | 1 |
| Peter Mark Richman | Andrew Hatcher | 1 |
| Dan Frazer | Reporter | 1 |
| Russ Conway | Detective Harding | 1 |
| Roy Engel | Dr. Frederick Rogers | 1 |
| Carol Eve Rossen | Selene Lowell | 1 |
| Byron Morrow | Gilbert | 1 |
| Byron Morrow | Col. Newcomb | 1 |
| Garry Walberg | Detective Reagan | 1 |
| Mark Roberts | Dr. Sam Larousse | 1 |
| Linden Chiles | Dr. Bob Vincent | 1 |
| Linden Chiles | Jeremy Mace | 1 |
| Robert Sorrells | Station Attendant | 1 |
| Robert Sorrells | Deputy Jim | 1 |
| Peter Hobbs | Colonel | 1 |
| Virginia Christine | Mrs. Thorne | 1 |
| Roberto Contreras | Guide | 1 |
| Booth Colman | Coroner Braemer | 1 |
| Chris Robinson | Mike Calvin | 1 |
| Warren Vanders | Earl | 1 |
| Ross Hagen | Jorden | 1 |
| Ross Hagen | Perry | 1 |
| Jonathan Goldsmith | Kevin Ryan | 1 |
| Pepe Callahan | Guide | 1 |
| Ken Lynch | Lieutenant Conners | 1 |
| Argentina Brunetti | Luz | 1 |
| Alex Gerry | Senator Robert Breeding | 1 |
| Bill Quinn | Police Lieutenant Eaton | 1 |
| Ted Markland | Alien | 1 |
| Theo Marcuse | Noel Markham | 1 |
| Harry Lauter | Alien | 1 |
| Don Chastain | Blake | 1 |
| Simon Scott | Dr. Malcolm Gantley | 1 |
| Simon Scott | Maj. Pete Stanhope | 1 |
| Simon Scott | Dr. John Slaton | 1 |
| Jack Bannon | Junior Officer | 1 |
| Alex Rodine | Guard | 1 |
| Dick Cherney | Police Officer (uncredited) | 1 |
| Austin Willis | William Gehrig | 1 |
| Robert Emhardt | Oliver Ames | 1 |
| Don Kennedy | Guard | 1 |
| Mark Allen | Second Mate | 1 |
| James McCallion | Brennan | 1 |
| Dawn Wells | Eileen Brown | 1 |
| Tom Steele | Workman (uncredited) | 1 |
| Stuart Nisbet | Coroner | 1 |
| Claudia Bryar | Townswoman | 1 |
| Rayford Barnes | Alien Deputy | 1 |
| Rayford Barnes | Alien Driver | 1 |
| Susan Davis | Mrs. James | 1 |
| Carlos Romero | Luis Perez | 1 |
| Sandy Kenyon | Alien Leader | 1 |
| Sam Edwards | Hank | 1 |
| Sam Edwards | Thatcher | 1 |
| Irene Tedrow | Clare Lapham | 1 |
| Arch Johnson | Father Paul | 1 |
| Rose Hobart | Housekeeper - Irma | 1 |
| Troy Melton | Chauffeur | 1 |
| Troy Melton | Journalist | 1 |
| Robert Biheller | Ricky | 1 |
| Richard X. Slattery | Riley | 1 |
| Roger Perry | Bill Shay | 1 |
| Lloyd Gough | Joe McMullen | 1 |
| Bartlett Robinson | Art Llewellan | 1 |
| Christine Matchett | Elizabeth Garber | 1 |
| Raymond Guth | Guard | 1 |
| Kathleen Widdoes | Ellen Woods | 1 |
| Pamela Curran | Louise | 1 |
| John Kellogg | Dom | 1 |
| Mark Tapscott | Guard | 1 |
| Logan Field | Carl Gidney | 1 |
| Ivan Bonar | Older Alien | 1 |
| Barry Russo | Lt. Alvarado | 1 |
| William Challee | Danielson | 1 |
| D'Urville Martin | Casey | 1 |
| Jason Wingreen | Court Clerk | 1 |
| Paul Comi | Danny | 1 |
| Paul Comi | Police Sgt. Leeds | 1 |
| Eldon Quick | Antique Store Proprietor | 1 |
| Barry Cahill | Dorsey | 1 |
| Dort Clark | Security Officer | 1 |
| William Bramley | Constable Gabbard | 1 |
| Michael McGreevey | Eddie McKay | 1 |
| Paul Sorensen | Alien | 1 |
| Peter Coe | Leo | 1 |
| Vince Howard | Frank | 1 |
| Robert Yuro | Simms | 1 |
| Robert Brubaker | Gen. Winters | 1 |
| Larry Duran | Houseboy | 1 |
| Lawrence Montaigne | Man | 1 |
| Lawrence Montaigne | Garth | 1 |
| Karl Held | Lieutenant | 1 |
| Paul Lukather | Correll | 1 |
| Stewart Moss | Hadley Jenkins | 1 |
| Lew Brown | Non-Com in Charge | 1 |
| Lew Brown | Aide | 1 |
| Ernest Harada | George - Waiter | 1 |
| Than Wyenn | Torberg | 1 |
| Richard Karlan | Charles Roselli | 1 |
| Robert Patten | Murphy | 1 |
| Robert Knapp | Congressman Joe Bonning | 1 |
| Robert Knapp | Lt. Col. Howell | 1 |
| Wilhelm von Homburg | Alien Patient | 1 |
| Donald Davis | Harland | 1 |
| Donald Davis | Lucien | 1 |
| Hank Brandt | Man | 1 |
| Hank Brandt | Joe Manners | 1 |
| Dean Harens | Dr. MacLeuen | 1 |
| William Wintersole | Alien | 1 |
| William Wintersole | Carr | 1 |
| Johnny Jensen | Young Nat | 1 |
| Johnny Jensen | Frankie Reed | 1 |
| Stephen Brooks | Officer Joe Nash | 1 |
| Richard O'Brien | Police Sergeant | 1 |
| Richard O'Brien | Prof. Charles McKay | 1 |
| Richard O'Brien | Brother John | 1 |
| Joel Fluellen | Butler | 1 |
| Joel Fluellen | Homer Warren | 1 |
| Roy Poole | Cort | 1 |
| Martin West | Lieutenant | 1 |
| Pedro Regas | Beggar | 1 |
| Pat O'Hara | Scientist | 1 |
| Geoffrey Deuel | Teen | 1 |
| Christopher Shea | Jimmy | 1 |
| Christopher Shea | Johnny | 1 |
| Nellie Burt | Lena Lapham | 1 |
| William Sargent | Dr. Ken Harrison | 1 |
| William Sargent | Dr. John Devin | 1 |
| Laura Devon | Susan Carver | 1 |
| Garth Pillsbury | Intern | 1 |
| John Lasell | Bob Ferrara | 1 |
| Michael Harris | 1 | |
| Michael Harris | Mail Truck Driver | 1 |
| Herb Armstrong | Doctor Stark | 1 |
| Paul Pepper | Dispatcher | 1 |
| Danni Sue Nolan | Nurse | 1 |
| William Stevens | Cobbs | 1 |
| William Stevens | Sergeant | 1 |
| Craig Chudy | Alien | 1 |
| Craig Chudy | Alien (uncredited) | 1 |
| Harry Hickox | Bowman | 1 |
| Tina Menard | Mama | 1 |
| Tina Menard | Maid | 1 |
| Steve Cory | Attendant | 1 |
| Tom Palmer | Spence | 1 |
| Tom Palmer | Dorian | 1 |
| Ron Stokes | Alien at Controls | 1 |
| David Armstrong | MP | 1 |
| Amy Douglass | Mrs. Wilk | 1 |
| Bonnie Beecher | Woman | 1 |
| Mary Gregory | Secretary | 1 |
| Phyllis Thaxter | Sarah Concannon | 1 |
| Lee Millar | Reporter | 1 |
| Barbara Dodd | Miss Fox | 1 |
| Mark Miller | Jack Palay | 1 |
| Ron Husmann | Sentry | 1 |
| Barry Atwater | Dorcas | 1 |
| Kelly Thordsen | Police Chief Sam Thorne | 1 |
| Lin McCarthy | Fellows | 1 |
| Larry Thor | Dr. Bill Jacobs | 1 |
| Jan Merlin | Post | 1 |