Watch Mission: Impossible - Dead Reckoning Part One (2023) online

Mission: Impossible – Dead Reckoning Part One is a 2023 American spy action film directed by Christopher McQuarrie, from a screenplay he co-wrote with Erik Jendresen. It is the sequel to Mission: Impossible – Fallout (2018) and the seventh installment in the Mission: Impossible film series. Dead Reckoning Part One sees Tom Cruise return as Ethan Hunt, whose IMF team matches wits with a powerful rogue AI known as "the Entity". The ensemble cast also features Hayley Atwell, Ving Rhames, Simon Pegg, Rebecca Ferguson, Vanessa Kirby, Esai Morales, Pom Klementieff, Mariela Garriga, and Henry Czerny.

In January 2019, Cruise announced that the seventh and eighth Mission: Impossible films would be shot back-to-back with McQuarrie writing and directing both films. Returning and new cast members were announced soon after, and Lorne Balfe, who composed the score for Fallout, returned to score the film. Filming began in Italy in February 2020 but was halted due to the COVID-19 pandemic. It resumed later that year and wrapped in September 2021 with other filming locations, including Norway, the United Kingdom, Italy, and the United Arab Emirates. It is the first film in the series since Mission: Impossible 2 (2000) not to involve J. J. Abrams in any capacity and is also the first film in the series to not be produced by Bad Robot Productions since Mission: Impossible III (2006). With an estimated budget of $291 million, it is one of the most expensive films ever made, and the most expensive in the franchise.

Mission: Impossible – Dead Reckoning Part One premiered on the Spanish Steps in Rome on June 19, 2023, and was theatrically released in the United States on July 12, 2023, by Paramount Pictures. It received acclaim from audiences and critics alike and has grossed $522 million worldwide, becoming the tenth highest-grossing film of 2023. A sequel, Dead Reckoning Part Two, is set to be released on June 28, 2024.

The next-generation Russian submarine Sevastopol employs an advanced AI for testing a new navigation system that uses dead reckoning. The AI tricks the crew into firing a torpedo and then turns the torpedo back on the submarine, sinking it and killing all aboard.

IMF agent Ethan Hunt travels to the Empty Quarter of the Arabian Desert to retrieve half of a cruciform key from disavowed ex-MI6 agent Ilsa Faust, on whom the IMF has placed a bounty. He then infiltrates a meeting of leaders of the U.S. Intelligence Community in Washington, D.C., including CIA Director Eugene Kittridge and Director of National Intelligence Denlinger, to discuss the rogue AI. Calling it the Entity, they recount how it has achieved sentience and infiltrated the major defense, intelligence, and financial networks of the world. World powers compete to obtain the key to protect their national security and control the Entity, though the exact means of controlling it are unknown. Believing the Entity poses too great a threat to humanity, Ethan seeks to destroy it.

He and his teammates Benji Dunn and Luther Stickell travel to Abu Dhabi International Airport to intercept the holder of the other half-key. Ethan evades US agents as well as Gabriel, an Entity liaison and terrorist with ties to Ethan's pre-IMF past, while the half-key is stolen by a professional thief named Grace. Luther identifies a suspicious piece of baggage; Benji finds what appears to be a nuclear explosive, but finds it empty after narrowly defusing it. Ethan pursues Grace to Rome. After a lengthy chase, Grace escapes again, while Ethan reunites with Benji, Luther, and Ilsa. Ilsa informs him that she is involved in this because a group of MI6 agents, her former colleagues, determined that they must prevent the key from falling into British Government hands since their government seeks to control it rather than destroy it.

With Benji and Luther providing support, Ethan and Ilsa infiltrate a party held by the arms dealer Alanna Mitsopolis in Venice, hoping to find who hired Grace and learn of the key's purpose. Grace encounters Gabriel and learns that Alanna hired her to steal the half-key. Ethan unsuccessfully attempts to dissuade a fearful Alanna from selling it. Gabriel reveals that the Entity has infiltrated the party and determined that one of Ethan's allies, either Ilsa or Grace, will die. They all scatter afterward, with Ethan subduing but sparing Gabriel's subordinate, Paris, while Gabriel subdues Grace and seemingly kills Ilsa, devastating Ethan. A remorseful Grace commits to joining the IMF and agrees to impersonate Alanna as they prepare to board the Innsbruck-bound Orient Express, where she will meet with her buyer. Luther leaves for an off-grid location to investigate isolated traces of the Entity in his hard drive, warning Ethan not to kill Gabriel out of vengeance, as only Gabriel knows how to use the key.

On the train, Gabriel kills the engine crew and destroys the throttle and brake. He meets Denlinger, who proposes an alliance between himself and the Entity. Denlinger explains that the Entity was originally an advanced cyber weapon developed by the United States that "overperformed" when it infiltrated the Sevastopol and subsequently went rogue. He reveals that the complete key unlocks the chamber housing the computer of the Sevastopol, which contains the early version of the Entity that can be used to control or destroy it, once and for all. Gabriel kills Denlinger and, suspecting Paris will betray him after Ethan spared her in Venice, attempts to kill her as well. Impersonating Alanna, Grace brings the complete key to Alanna's buyer, revealed to be Kittridge. Though tempted to betray Ethan for $100 million and protection for herself, Grace decides against it, pickpockets the key from Kittridge and flees. Ethan parachutes off a cliff onto the train to save Grace from her pursuers, but Gabriel acquires the key.

Ethan overpowers Gabriel atop the train, but the latter escapes and detonates a bridge ahead. Grace and Ethan detach the locomotive from the rest of the train, which trips a fail safe which saves the passengers. A revived Paris rescues them from falling off the bridge and reveals the key's connection to the Sevastopol. Grace informs Kittridge of her new commitment to the IMF, which he accepts while Ethan flees the train with the complete key, which he had pickpocketed from Gabriel during their skirmish.