
U.S. Navy Lieutenant Gregg Masterman, a Harvard graduate from the Boston Back Bay Masterman family, honed his seamanship by winning silver cups sailing his own yacht. Rapidly promoted, he now serves as Junior Aide to Rear Admiral Stephen Thomas, navigating duty and ambition in a high‑stakes naval drama.
Does Stand by for Action have end credit scenes?
No!
Stand by for Action does not have end credit scenes. You can leave when the credits roll.
See current US streaming, rental, and purchase options for Stand by for Action (1942) via JustWatch.
Explore the complete cast of Stand by for Action, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Billy Bletcher
Sailor (uncredited)

Walter Brennan
Chief Yeoman Henry Johnson

Jim Davis
Talker (uncredited)

Chill Wills
Mate Jenks, Chef-Bootsmann

Hobart Cavanaugh
Carpenter's Mate 'Chips'

Henry O'Neill
Cmdr. Stone M.C

Charles Laughton
Rear Admiral Stephen Thomas

Wally Cassell
Talker (uncredited)

Douglas Fowley
Ensign Martin

Robert Taylor
Lieut. Gregg Masterman

Tim Ryan
Lt. Tim Ryan

Brian Donlevy
Lieut. Cmdr. Martin Roberts

William Tannen
Flag Lt. Dudley

Douglass Dumbrille
Capt. Ludlow

Sam Harris
Senator at Party (uncredited)

Marilyn Maxwell
Audrey Carr

Byron Foulger
Pharmacist's Mate 'Doc' Miller

William Roberts
Marine Messenger (uncredited)

Douglas Wood
Sen. Masterman (uncredited)

Harry 'Snub' Pollard
Sailor (uncredited)

Elizabeth Russell
Expectant Mother (uncredited)

Frank McLure
Ship Officer (uncredited)

Ben Welden
Chief Quartermaster Rankin

Duke York
Sailor (uncredited)

Harry Wilson
Sailor (uncredited)

Frank Hagney
Sailor (uncredited)

James Millican
Talker (uncredited)

Theodore von Eltz
Commander (uncredited)

Dick Simmons
Lt. (jg) Royce

Spec O'Donnell
Jason (uncredited)

Hal Le Sueur
Lookout (uncredited)

Marta Linden
Mary Collins

Inez Cooper
Susan Garrison

Robert Kent
Hank Nels (uncredited)

Harry Fleischmann
Chief Signalman
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Which actor portrayed Lieutenant Gregg Masterman?
Read the complete plot summary of Stand by for Action, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
In the early months of the United States’ involvement in World War II, Lieut Gregg Masterman, Robert Taylor, enjoys a cushy posting as the junior aide to Rear Admiral Stephen “Old Ironpants” Thomas, Charles Laughton. After a misstep in giving advice to the seasoned Lieutenant Commander Martin Roberts, Brian Donlevy, the admiral shifts Roberts to command of a revived World War I–era destroyer, the USS Warren, and assigns Masterman as his executive officer. To keep the Warren running, Masterman teams with Henry Johnson, the ship’s civilian caretaker, Walter Brennan, who had once been part of the Warren’s crew and knows the ship’s quirks well enough to help him reenlist in the Navy and sail again aboard his beloved vessel.
Under Roberts’ steady guidance, Masterman gradually grows into a capable seaman, though the captain forever reminds him that the mission must come first and that personal concerns cannot override the needs of the crew. The Warren faces danger when a Japanese plane first attacks; Masterman’s inexperience leads to an error that prevents them from shooting it down, underscoring the high stakes of every decision at sea.
Admiral Thomas orders a convoy run from Honolulu to San Francisco, and when one escort destroyer breaks down, the Warren is pressed into service as its replacement. As the fleet forges ahead at flank speed through a heavy Pacific squall, Johnson suffers a concussion. Masterman chooses to ease the ride by slowing the ship—an action that helps the civilian caretaker recover, but blurs the line between procedure and instinct in the heat of crisis. Johnson’s delirium lingers, and he believes he is back aboard the destroyer during the war, clinging to memories of the Warren and its former glory.
Before the convoy reaches safety, the Warren encounters a lifeboat from a torpedoed vessel carrying two pregnant women and twenty babies, along with a small group of evacuees from a maternity hospital. The ship must navigate the delicate balance of duty and compassion, making careful choices to protect all those aboard while keeping the mission on track, even as births occur amid the chaos.
A second Japanese attack cripples the flagship’s steering; the Warren answers with a bold counterstrike. The battleship emerges from a fog bank and opens fire, but Roberts devises a daring plan: set up a heavy smoke screen, loop behind it, and launch a spread of torpedoes at close range. When the captain is injured, Masterman must assume command, while the recovered Johnson returns from sickbay to take the helm at a critical moment. Johnson’s presence steadies the ship as the Warren delivers a decisive volley, firing six torpedoes that strike the battleship’s magazines and destroy the carrier’s principal adversary.
Returning to San Francisco, a formal ceremony unfolds aboard the repaired USS Warren. Admiral Thomas presents Roberts, Masterman, and a recovered Johnson with the Navy Cross, the nation’s highest honor, awarded by the president, marking a recognition of courage, growth, and teamwork under pressure.
This tale celebrates leadership forged under fire, the perseverance of crew and ship, and the quiet strength found in trusting one another when the stakes are highest.

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