Former chorus boy who would become a star in "B" westerns, and later a successful comedy writer (under the name David Barclay) and TV director. O'Brien is notable as one of the relatively few success stories to emerge out of the drek of poverty row, where he blissfully worked for nearly a decade before landing work in the hypo-nasal Pete Smith's series of novelty shorts at MGM. In the mid-50's he gravitated toward comedy writing working on the Red Skelton Show, striking up a longtime friendship with series co-writer Sherwood Schwartz.
| Movie | True Colors | Student (uncredited) | 1991-03-15 |
| Movie | That's Entertainment, Part II | (archive footage) | 1976-05-16 |
| Movie | The Big Parade of Comedy | Actor in the Pete Smith Shorts (archive footage) | 1964-09-02 |
| Movie | The Kettles in the Ozarks | Conductor | 1956-04-01 |
| Movie | The Desperados Are in Town | Dock Lapman / Mr. Brown | 1956-11-01 |
| Movie | The Fall Guy | Himself as Various Characters (archive footage) | 1955-06-04 |
| Movie | Ain't It Aggravatin' | Parking Space Hog / Apartment House Manager / Frugal Man / Harry Hollowhead | 1954-02-06 |
| Movie | Tennessee Champ | Luke MacWade | 1954-03-03 |
| Movie | Things We Can Do Without | Thaddeus E. Thud III | 1953-12-05 |
| Movie | T.V. of Tomorrow | Man on TV | 1953-06-06 |
| Movie | Cash Stashers | A Shmoe Named Joe | 1953-08-29 |
| Movie | Did'ja Know? | Expectant Father / Greeting Card Shopper / Hospital Patient / Job Applicant | 1950-05-06 |
| Movie | A Wife's Life | George T. Hardnose (uncredited) | 1950-09-01 |
| Movie | I Love My Mother-In-Law But... | The Son-In-Law / Husband | 1948-02-07 |
| Movie | I Love My Wife BUT! | The Husband | 1947-04-05 |
| Movie | I Love My Husband, But! | The Husband | 1946-12-07 |
| Movie | Equestrian Quiz: What's Your I.Q.? No. 11 | Horace | 1946-05-18 |
| Movie | Studio Visit | O'Brien | 1946-05-11 |
| Movie | Sure Cures | Xavier T. Schneckendorf | 1946-11-02 |
| Movie | The Phantom of 42nd Street | Tony Woolrich | 1945-05-02 |
| Movie | Marked for Murder | Dave Wyatt | 1945-02-08 |
| Movie | The Man Who Walked Alone | Marion Scott | 1945-03-15 |
| Movie | Enemy of the Law | Dave Wyatt | 1945-05-07 |
| Movie | Three in the Saddle | Dave Wyatt | 1945-07-26 |
| Movie | Flaming Bullets | Dave Wyatt / Steve Carson | 1945-10-14 |
| Movie | Frontier Fugitives | Dave Wyatt | 1945-09-01 |
| Movie | Spook Town | Tex Wyatt | 1944-06-03 |
| Movie | The Pinto Bandit | Tex Wyatt | 1944-04-26 |
| Movie | Movie Pests | Feet-in-the-Aisle Pest | 1944-07-08 |
| Movie | Guns of the Law | Tex Wyatt | 1944-03-30 |
| Movie | Outlaw Roundup | Tex Wyatt | 1944-02-10 |
| Movie | Brand of the Devil | Tex Wyatt | 1944-07-30 |
| Movie | The Whispering Skull | Dave Wyatt | 1944-12-29 |
| Movie | Dead or Alive | Dave Wyatt | 1944-11-09 |
| Movie | Gangsters of the Frontier | Dave Wyatt | 1944-09-22 |
| Movie | Gunsmoke Mesa | Tex Wyatt | 1944-09-01 |
| Movie | West of Texas | Tex Wyatt | 1943-05-10 |
| Movie | Bad Men of Thunder Gap | Tex Wyatt | 1943-03-05 |
| Movie | Border Buckaroos | Tex Wyatt | 1943-06-15 |
| Movie | Fighting Valley | Tex Wyatt | 1943-08-08 |
| Movie | Boss of Rawhide | Tex Wyatt | 1943-11-20 |
| Movie | The Return of the Rangers | Tex Wyatt | 1943-10-26 |
| Movie | Trail of Terror | Tex Wyatt / Curly Wyatt | 1943-09-06 |
| Movie | Prisoner of Japan | U. S. Marine | 1942-07-22 |
| Movie | Law and Order | Jeff Travis | 1942-08-21 |
| Movie | Captain Midnight | Captain Albright / Captain Midnight | 1942-02-15 |
| Movie | Sheriff of Sage Valley | Jeff | 1942-09-02 |
| Movie | Billy the Kid's Smoking Guns | Jeff | 1942-05-01 |
| Movie | Down Texas Way | Dave Dodge | 1942-05-22 |
| Movie | Carry Harry | Arthur - Harry's Friend | 1942-09-03 |
| Movie | 'Neath Brooklyn Bridge | Sgt. Phil Lyons | 1942-11-20 |
| Movie | The Rangers Take Over | Tex Wyatt | 1942-12-25 |
| Movie | The Yanks Are Coming | Sgt. Callahan | 1942-11-09 |
| Movie | Bowery at Midnight | Det. Pete Crawford | 1942-10-30 |
| Movie | Murder by Invitation | Michael, the chauffeur | 1941-06-30 |
| Movie | Billy the Kid in Santa Fe | Texas Joe | 1941-07-11 |
| Movie | The Spider Returns | Jackson, Wentworth's Aide | 1941-05-09 |
| Movie | The Deadly Game | Ralph Spencer | 1941-08-08 |
| Movie | Flying Wild | Tom Lawson | 1941-03-10 |
| Movie | The Texas Marshal | Buzz Weston | 1941-07-12 |
| Movie | The Gunman From Bodie | Joe Martin | 1941-09-19 |
| Movie | Forbidden Trails | Jim Cramer | 1941-12-25 |
| Movie | Double Trouble | Sparky Barton | 1941-11-21 |
| Movie | Spooks Run Wild | Jeff Dixon | 1941-10-24 |
| Movie | Billy the Kid Wanted | Jeff | 1941-10-03 |
| Movie | Son of the Navy | Nelson | 1940-03-30 |
| Movie | Phantom Rancher | Henchman Lucke | 1940-03-31 |
| Movie | Isle Of Destiny | Whitey - Navy Radio Man | 1940-03-08 |
| Movie | Yukon Flight | Constable Kelly | 1940-01-02 |
| Movie | Danger Ahead | Corporal Kelly | 1940-01-22 |
| Movie | East Side Kids | Knuckles Dolan | 1940-02-10 |
| Movie | Murder on the Yukon | Constable Kelly | 1940-02-25 |
| Movie | On the Spot | Charlie | 1940-06-11 |
| Movie | The Cowboy from Sundown | Steve Davis | 1940-09-05 |
| Movie | That Gang of Mine | Knuckles Dolan | 1940-09-23 |
| Movie | Hold That Woman! | Miles Hanover | 1940-06-28 |
| Movie | Queen of the Yukon | Bob Adams | 1940-08-26 |
| Movie | The Devil Bat | Johnny Layton | 1940-12-13 |
| Movie | Gun Code | Henchman Gale | 1940-08-03 |
| Movie | Sky Bandits | Constable Kelly | 1940-07-06 |
| Movie | Boys of the City | Knuckles Dolan | 1940-07-15 |
| Movie | Outlaws' Paradise | Henchman Meggs | 1939-04-18 |
| Movie | Undercover Agent | Billiards Player | 1939-04-19 |
| Movie | Texas Wildcats | Ed Arden | 1939-04-09 |
| Movie | Riders of the Sage | Tom Martin | 1939-08-01 |
| Movie | Code of the Cactus | Bob Swane | 1939-02-25 |
| Movie | New Frontier | Jason Braddock | 1939-08-10 |
| Movie | Water Rustlers | Bob Lawson | 1939-01-06 |
| Movie | Rollin' Westward | Ranch hand Red | 1939-03-01 |
| Movie | Wyoming Outlaw | Acacia Park Game Warden | 1939-06-27 |
| Movie | Fighting Mad | Constable Kelly | 1939-11-05 |
| Movie | Buried Alive | Carson | 1939-11-06 |
| Movie | Daughter of the Tong | Jerry Morgan | 1939-08-28 |
| Movie | Mutiny in the Big House | Daniels | 1939-10-24 |
| Movie | Flaming Lead | Frank Gordon | 1939-11-01 |
| Movie | On Your Toes | Man in Audience | 1939-10-14 |
| Movie | The Fighting Renegade | Dr. Jerry Leonard | 1939-08-31 |
| Movie | Crashing Thru | Fred Chambers | 1939-12-11 |
| Movie | The Arizona Kid | Soldier | 1939-09-28 |
| Movie | The Singing Cowgirl | Dick Williams | 1938-06-02 |
| Movie | Whirlwind Horseman | Henchman Slade | 1938-04-29 |
| Movie | Born to Be Wild | Trucker (uncredited) | 1938-02-16 |
| Movie | Tell Your Children | Ralph | 1938-06-15 |
| Movie | The Secret of Treasure Island | Det. Jameson [Chs. 4-7] | 1938-03-17 |
| Movie | Where the Buffalo Roam | Jeff Gray | 1938-10-12 |
| Movie | Song of the Buckaroo | Tex Alden | 1938-12-07 |
| Movie | Man's Country | Bat | 1938-07-06 |
| Movie | Frontier Scout | Steve Norris | 1938-09-16 |
| Movie | Starlight Over Texas | Henchman | 1938-09-06 |
| Movie | Utah Trail | Mason - Bookkeeper | 1938-08-12 |
| Movie | Lightnin' Crandall | Tommy Shannon | 1937-03-24 |
| Movie | Brothers of the West | Bart | 1937-06-29 |
| Movie | Million Dollar Racket | Johnny Henessey | 1937-09-30 |
| Movie | Rough Riding Rhythm | Detective Waters | 1937-08-14 |
| Movie | The Adventures of Frank Merriwell | George Baldwin | 1936-01-13 |
| Movie | The Black Coin | Terry Navarro | 1936-09-01 |
| Movie | Wanted - A Master | Dog's Master (uncredited) | 1936-12-26 |
| Movie | The Girl on the Front Page | Nightclub Patron | 1936-09-26 |
| Movie | No More Ladies | Party Guest (uncredited) | 1935-06-14 |
| Movie | Doubting Thomas | Member of Audience | 1935-07-10 |
| Movie | Woman Wanted | Steve - Tap Dancer at Baxter's Party (uncredited) | 1935-08-02 |
| Movie | She Married Her Boss | Shopper | 1935-09-19 |
| Movie | Murder at the Vanities | Chorus Boy (uncredited) | 1934-05-18 |
| Movie | Wonder Bar | Chorus Boy (uncredited) | 1934-03-31 |
| Movie | Search for Beauty | Talent Contestant (uncredited) | 1934-02-02 |
| Movie | Tomorrow's Children | Interne (uncredited) | 1934-07-02 |
| Movie | Music in the Air | Karl Roder (singing voice) (uncredited) | 1934-12-13 |
| Movie | We're Rich Again | Pete (uncredited) | 1934-07-13 |
| Movie | Student Tour | Student | 1934-10-05 |
| Movie | Gift of Gab | Dancer (uncredited) | 1934-09-01 |
| Movie | College Humor | Student | 1933-07-05 |
| Movie | One Man's Journey | Dance Extra (uncredited) | 1933-08-31 |
| Movie | Pick-up | Party Boy (uncredited) | 1933-03-24 |
| Movie | The World Changes | Otto Peterson (uncredited) | 1933-11-25 |
| Movie | College Coach | Student on Tennis Court (uncredited) | 1933-11-04 |
| Movie | Sitting Pretty | Assistant Cameraman (uncredited) | 1933-11-23 |
| Movie | Roar of the Dragon | Submarine Crewman | 1932-07-08 |
| Movie | Is My Face Red? | Chorus Boy (uncredited) | 1932-06-17 |
| Movie | Pack Up Your Troubles | Extra (uncredited) | 1932-09-16 |
| Movie | Devil and the Deep | Submarine Crewman (uncredited) | 1932-08-12 |
| Movie | Hot Saturday | Party Guest (Uncredited) | 1932-10-28 |
| Movie | The Sign of the Cross | Christian on Stairway (uncredited) | 1932-12-25 |
| Movie | Rasputin and the Empress | Soldier (uncredited) | 1932-12-23 |
| Movie | Flying High | Dancer (uncredited) | 1931-11-14 |
| Movie | Consolation Marriage | Man Picking Up Stack of Newspapers (uncredited) | 1931-11-21 |
| Movie | The Dawn Patrol | Pilot (uncredited) | 1930-07-10 |
| Movie | Good News | Student | 1930-08-22 |
| Movie | Madam Satan | Zeppelin Reveler | 1930-09-20 |
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