December 7th is a 1943 propaganda documentary film produced by the US Navy and directed by Gregg Toland and John Ford, about the December 7, 1941 attack on Pearl Harbor, the event which sparked the Pacific War and American involvement in World War II. Toland was also the film's cinematographer and co-writer. The original version of this film, with a running time of 82 minutes, was not released but was retained by the National Archives. An edited version of 32 minutes length, which removed a long introductory segment and a shorter epilogue, was given limited release to specific audiences but won the Academy Award for Best Documentary (Short Subject) in 1944. This is the only film Toland ever worked on for which he received a director credit.

Opening shots show the wreck of USS Arizona and a destroyed B17 bomber, followed by a shot of a damaged aircraft hangar. Two metal beams cast a V (for "Victory")-shaped shadow over what appears to be a large blood stain, as well as an American seaman's cap. These shots are followed by excerpts of memos from Secretary of War Henry Stimson and Secretary of the Navy Frank Knox, each endorsing the project of making a film about the attack. The "V" shadow is still superimposed over each memo.

The narrative begins with shots of Oahu while a narrator announces that it is "early Sunday [December 7, 1941] on the island of Oahu" where a figure of Uncle Sam is shown sleeping on a lounge chair in a Hawaiian house. The city of Honolulu is also described as "unsuspecting" and asleep. Soldiers and sailors are shown on guard against sabotage or domestic threats but not against invasion from abroad. Airplanes at Hickham Field and ships at Pearl Harbor are shown at rest, while other soldiers and sailors are shown at work, playing ball, and at a Sunday field mass. A Private Joseph Lockhart, at the aircraft warning system, detects a fleet of airplanes approaching, but he is assured by an officer that they are probably American planes returning from a training mission. Shortly after, Japanese planes begin to fly over the island from different directions while in Washington, D.C. Japanese envoys discuss peace with Secretary of State Cordell Hull.

Recreated shots depict Japanese airplanes attacking, along with shots of buildings, ships, and personnel being destroyed, while servicemen return fire from guns and battleships. The attack ends by 9:45 a.m., described as "one hour and fifty minutes of perfidy." Emphasis is placed in the narration on the heroism of the American defenders and on Japanese losses, including the capture of two-man submarines. Tribute is also paid to the American lives lost. Several dead servicemen "announce" their names and home towns as a picture of each and shots of their families are shown. The dead represent a range of American geographic locations and ethnicities, but each is voiced by the same actor because "We are all alike. We are all Americans." A memorial service follows, accompanied by the song "My Country 'Tis of Thee." followed by a bugle playing "Taps."

The last ten minutes of this version focus on countering Japanese propaganda and displaying American preparations for reprisal and war. A map of Japan superimposed with depictions of several large radio transmitter towers accompanies what purports to be a victory broadcast by Japanese Prime Minister Tojo, spoken in English in a harsh, grossly stereotypical Japanese accent. The narrator gently rebuts Tojo's claims with "actual facts," such as how some ships that were supposedly destroyed are already being salvaged and repaired. The narrator also notes the influx of U.S. personnel and materiel from the mainland and how America's military buildup in immediately preceding years has enabled Hawaii to still claim to be "the greatest military and naval fortress in the world." Civil defense measures, starting with a proclamation of martial law on the islands by Territorial Governor Joseph Poindexter, are also displayed, although some parts of images are blacked out and marked "Censored." Children (the large majority of whom are of Asian or Pacific heritage) are shown participating in air raid drills and donning gas masks. The narrator explains that parents have cooperated because "this war is a war of survival, a people's war." Noting that the attack had served to "further complicate the already complex life of the Japanese in Hawaii," the narrator refers to images of Japanese merchants and others covering up Japanese-language signs or replacing them with patriotic names in English, while Japanese language schools and Shinto temples have been closed. The narrator ends by promising "Mr. Tojo" that "all they who take the sword shall perish by the sword."

The short version of December 7th, as described above, was cut down by John Ford and film editor Robert Parrish from the longer film completed under Gregg Toland's direction. Toland's version included a long prologue, consisting of a staged argument between "Uncle Sam" (Walter Huston) and "Mr. C" (Harry Davenport), who refers to himself as Uncle Sam's "conscience." The middle portion, depicting the attack and its aftermath, is largely the same as in the shorter version, although a few shots have been cut. There is also a final epilogue in the longer version, depicting a conversation between the ghost of a U.S. Navy sailor (Dana Andrews) and the ghost of a dead soldier from World War I (Paul Hurst). This summary concentrates on the prologue and epilogue.

After an opening with the same shots as in the shorter version—of damage from the Japanese attack and of the memos from Secretaries Stimson and Knox—the film begins with shots of the Hawaiian landscape. The day is marked as December 6, the day before the attack. We next see Uncle Sam ("U.S." played by Walter Huston) in a house on a hilltop in Honolulu, dictating a letter to a "Miss Kim" for a recipient named "Jonathan." Uncle Sam extols the physical beauty of this "heaven," claiming that he is going to take his shoes off and relax. He is interrupted, though, by the appearance of Mr. C (Henry Davenport). Miss Kim is dismissed, and two resume the friendly quarrels they've had since the writing of the U.S. Constitution. Mr. C claims that he has come to "go over the books" for the year 1941 since "there's some balancing to be done."

Mr. C asserts that U.S. has not been himself lately, but that Mr. C's own "still small voice" has been able to reach Uncle Sam in previous times of trouble. He suggests that they discuss "Hawaii," asking what U.S. knows about sugarcane and pineapples. Accompanied by montages of workers harvesting and processing these commodities, U.S. launches into extended discussion and praise of the importance of these crops to Hawaii and how they've allowed for the transformation of Honolulu into a modern city, with schools, museums, libraries, and houses of worship "representing all denominations." He especially singles out the "Big Five" sugar companies--"the backbone, the nerve center, the brain of the Territory . . . held together by blood ties and interlocking directorates."