This thrilling and extraordinary tale follows the exploits of Dom Cobb, a professional thief who commits corporate espionage by infiltrating the subconscious of his targets.
He is offered a chance of redemption as payment for a task considered to be impossible: 'inception', the implantation of another person's idea into a target's subconscious. What happens when perceived reality becomes a dream? What will be the result of the inception?
This radical tale that incisively probes into the concept of reality, dream, and the manipulation of the conscious and subconscious mind through the trials and triumphs in the life of Dominick "Dom" Cobb (Leonardo DiCaprio) and his business partner Arthur (Joseph Gordon-Levitt).
The successful duo are "extractors", people who perform corporate espionage using an experimental military technology to infiltrate the subconscious of their targets and extract information while experiencing shared dreaming. Their latest target is Japanese businessman Saito (Ken Watanabe). The extraction from Saito fails when sabotaged by a memory of Cobb's deceased wife Mal (Marion Cotillard).
After Cobb's and Arthur's associate sells them out, Saito reveals that he was actually auditioning the team to perform the difficult act of "inception": planting an idea in a person's subconscious.
In order to break up the energy conglomerate of ailing competitor Maurice Fischer (Pete Postlethwaite), Saito wants Cobb to plant the idea of dissolving the company into the mind of Fischer's heir, son Robert Fischer (Cillian Murphy). Should Cobb succeed, Saito tells Cobb he will use his influence to clear Cobb of a murder charge, which will allow Cobb to return home and to his children. Cobb accepts Saito's offer.
Cobb sets about assembling his team: Eames (Tom Hardy), a conman and identity forger; Yusuf (Dileep Rao), a chemist who concocts the powerful sedative for a stable "dream within a dream" strategy; Ariadne (Ellen Page), an architecture student tasked with designing the labyrinth of the dream landscapes; and Arthur. Saito insists on accompanying the team to verify the team's success.
When the elder Fischer dies in Sydney, Robert Fischer accompanies the body on a flight back to Los Angeles, which the team uses as an opportunity to isolate Fischer. Cobb sedates him, bringing him into a shared dream with the extractors. Using a "dream within a dream" strategy, at each level in the layered dreaming, the person generating the dream stays behind to set up a "kick" that will be used to awaken the other sleeping team members who have entered another dream layer deeper.
Due to the effects of heavy sedation and multi-layered dreaming, death during the mission will result in entering Limbo, an expanse of infinite raw subconscious. Limbo is a space not dreamed by any one individual, but is shared space where one mind can make drastic alterations of any kind.
In the first level, Yusuf's rainy downtown dream, the team abducts Fischer; however, Fischer's trained subconscious projections attack, wounding Saito severely. Eames temporarily takes the appearance of Fischer's godfather, Peter Browning (Tom Berenger), to suggest Fischer reconsider his father's will.
Yusuf drives the team in a van as they are sedated into the second level, a hotel dreamed by Arthur. Here, the extractors recruit Fischer, convincing him that his kidnapping was orchestrated by Browning and that they are Fischer's subconscious dependency. In the third level, a snowy mountain fortress dreamed by Eames,
Fischer is told they are in Browning's subconscious, but they are really going deeper into Fischer's. Yusuf, under assault in the first level, initiates his kick too soon by driving off a bridge, removing the gravity of Arthur's dream world and causing an avalanche in Eames' dream, a kick which all missed. Arthur improvises a new kick using an elevator that will be synchronized with the van hitting the water, while the team in Eames' dream races to finish the job before the new round of kicks.
Saito succumbs to his wounds, and Cobb's projection of Mal sabotages the entire plan by killing Fischer, sending them both into Limbo. Cobb and Ariadne enter Limbo to find Fischer and Saito, while Eames remains on his dream level to set up a kick by rigging the fortress with explosives. Cobb reveals to Ariadne that he spent "50 years" with Mal in Limbo constructing a world from their shared memories while seemingly growing old together.
Returning to the waking world, Cobb and Mal found less than three hours had passed. Convinced she was still dreaming, Mal committed suicide and tried to persuade Cobb to do so too, by incriminating him in her death. Facing a murder charge Cobb fled the U.S., leaving his children behind, ostensibly in the shared care of his mother- and father-in-law, Prof. Stephen Miles (Michael Caine).
Through his confession, Cobb attains catharsis and chooses to remain in Limbo to search for Saito. Ariadne pushes Fischer off a balcony, resuscitating him at the mountain fortress, where he enters a safe room to discover and accept the planted idea: that his father wishes him to be his "own man", and that splitting up the conglomerate might not be a radical notion.
All team members other than Cobb and Saito ride the synchronized kicks back to reality: Ariadne jumps off a balcony in Limbo, Eames detonates the explosives in the fortress, Arthur blasts an elevator containing the team's sleeping bodies up an elevator shaft, and the van in Yusuf's dream hits the water. Cobb eventually finds an aged Saito in Limbo and the two remember their arrangement, presumably shooting themselves and waking to outer-world reality back on the airplane, where the entire team and Robert Fischer have awakened.
Upon arriving in Los Angeles, Cobb successfully passes through U.S. customs to his waiting father-in-law, who reunites him with his children. Cobb attempts to determine if he is dreaming or awake by spinning a top, but ignores its outcome to instead happily greet his family.
Character Error Dom slipped the sedative into Fischer's drink on the plane scene. The flight attendant, who was in on the plot, could have slipped it in beforehand, with much less chance of detection.
Continuity The crew busts into room 528 by kicking the door down, which should damage the lock. But it is seen that the lock is fully functional.
Continuity First scene fo this film where Saito spins Cobb's totem clockwise. When the same scene is shown at the end of the movie, the totem spins anticlockwise.
Continuity In the falling van scene, Arthur is sleeping without the headphones that were placed on his head. The headphones reappear before the van hits the water.
Shots of the falling van are interspersed with several stages of the dreams. But the van backtracks in several shots.
Continuity In the warehouse scene between Cobb and Ariadne, a Nikon DSLR camera on a desk behind Cobb disappears and reappears between shots several times.
Continuity When Arthur arrives in the hotel to get Cobb for their ride on the roof, it is dark outside, but when they are out on the roof, it is around noon.
Crew/Equipment Visible When Cobb confronts Mal at the hotel scene, in front of the open window with billowing curtains, a crew member's fingertips can be seen through the sheer fabric.
Crew/Equipment Visible When Fischer's cab is hijacked, numerous production markings are visible on the street which can be noticed easily.
Errors in Geography During the chase sequence scene in Mombasa (filmed in Morocco), the cars' steering wheels are on the left. In Kenya, where Mombasa is located, steering wheels are on the right.
Factual Mistake In Mombasa, the cars have yellow license plates in the front and back. Kenyan cars have white plates in front, and yellow plates in back.
If you take the first letters of the main characters' names - Dom, Robert, Eames, Arthur, Mal, and Saito
in the order, they spell "Dreams". If you add Peter, Ariadne, and Yusuf, the whole makes "Dreams Pay", which is what they do for a mind thief.
Joseph Gordon-Levitt performed all his stunts on his own except one of his own stunts during the fight scene in the spinning hallway.
This film marks the fifth Christopher Nolan movie to enter the IMDb Top 250, along with Memento (2000), Batman Begins (2005), The Prestige (2006), The Dark Knight (2008).
The running time of the film 2 hours 28 min is a reference to the original length of Édith Piaf's song "Non, je ne regrette rien", which lasts (on its first recorded edition) 2 minutes 28 seconds to be exact.
Joseph Gordon-Levitt went to his audition wearing a full suit after a brief character summary, unknowingly matching his character's wardrobe perfectly.
During production, details of the film's plot were kept secret from others. Christopher Nolan, who wrote the script, cryptically described it as a contemporary sci-fi action thriller.
Earlier Kate Winslet was approached for the role of Mal, but she turned it down, citing that she couldn't see herself as the character.
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