Dastan (Jake Gyllenhaal), a street urchin in the Persian Empire in the sixth century. After showing courage in the market place baffel, he is adopted by the king as his third son. The two older brothers are Tus (Richard Coyle) and Garsiv (Toby Kebbell). He grows up as part of the royal family with "no royal blood and no eye for the throne."
After this introductory scene, it's revealed the Persians are about to attack the sacred city of Alamut. They believe Alamut is selling weapons to the enemies of Persia, as shown by Nizam, the King's brother and adivisor(Ben Kingsley) and that's why Tus decides to attack the city. Garsiv, the head of Persian army, is supposed to lead the first attack. Dastan decides to lead a "backdoor" attack with his friend Bis (Reece Ritchie), against the command of his brother. He manages to open the main gate of the Alamut and prevents further casualties from both sides. During the fight in the city, Dastan kills one of the Tamina's guards who's in the possession of the mythical Dagger of Time. The dagger gives its owner the ability to go back in time for a short period and defy the future and its user is the only person that knows it's been used. Later on, Princess Tamina (Gemma Arterton) is captured and is offered as a wife for Tus, which would make the city of Alamut a part of Persian empire.
The Persians celebrate their victory and during the celebration, Prince Dastan is fooled into presenting a poisonous gown (given to him by Tus) to King Sharaman (Ronald Pickup), that further burns and kills the King. Prince Dastan is held as the cause for his father's murder. He escapes the castle with Princess Tamina while Bis his best friend is killed trying to save them. Together they embark on a journey: The Prince wants to prove his innocence and Tamina wants to safeguard the Dagger of Time. On the first night Tamina attempts to kill the prince and recover the dagger, but Dastan accidentally activates the dagger and learns about its ability to rewind time, in doing so prevents Tamina from attacking. Dastan believes that Tus knew about the dagger and framed Dastan for their father's murder in an attempt to seixe the throne and dagger, thus becoming the most powerful ruler of Persia.
During their journey, the duo then meets a group of outcast Tax-defaulters, including entrepreneur and Ostrich races organizer Sheik Amar (Alfred Molina) with his friend Seso (Steve Toussaint) who is a master of throwing knives. Dastan offers Tamina up as a slave in return for their hospitality, but then they try to take the Dagger of Time and present him to the newly crowned Tus because of the reward for his capture, but fail in the process, while the two escape.
Dastan and Tamina return to Persia for King Sharaman's funeral. Dastan tries to convince his uncle Nizam that he was not the cause of his father's death only to discover the dagger was taken by Tamina. Instead he notices the burns on Nizam's hands, which indicate he was the one who killed his father. Furthermore Nizam has set up an ambush for Dastan among the Persian streets, and after a conflict with his brother Garsiv, he escapes.
Dastan catches up with Tamina and explains that the villainous brother of the king, Nizam was behind it all. It's revealed that the attack was based on false allegations provided by Nizam and promoted with a motive to attain the Dagger of Time and use it with the massive Sandglass, which is hidden under the city of Alamut. This way Nizam would go back in time before he had saved the King Sharaman from being attacked by a Lion and undo the act, hence ensure that he becomes the King of Persia, even before the Emperor's son's were born. The Sandglass is the source of the Sands of Time, but by unleashing them, they transform into a massive sandstorm, which could destroy the entire world. The pair then put aside their differences and agree to work together to protect the dagger.
Meanwhile back in Persia, Nizam, aware that Dastan knows he was responsible, tries to convince king Tus and Garsiv that Dastan is trying to overthrow them and must be killedwithout trial to avoid a rebellion. When this fails, Nizam hires the Hassassins, a group of highly skilled warriors that were banished from the kingdom by Sharaman long ago.
Dastan and Tamina are then captured by Sheik Amar, Seso and their group. The chaos they caused back at the valley has irritated Sheik and he intends to claim the reward for turning them in. But that night, when everyone is asleep, the Hassassin leader attacks the group in an oasis by controlling a number of snakes, many die but Dastan uses the dagger to rewind time, and forseeing the attack manages to single handedly kill all the snakes,saving Seso in the process. The Hassassin leader then leaves in a sand tornado.
The next day, the pair, now accompanied by Sheik and Seso travel to the secret sanctuary in the mountains, where it's possible to destroy the dagger by returning it to the Gods. In order to do so, Tamina would have to sacrifice herself, but it doesn't happen as they encounter Garsiv. Dastan however manages to persuade his brother that he is innocent, only for Garsiv to be killed by a flurry of knives thrown by a Hassassin. Just as Tamina and Dastan are about to destroy the dagger, Tamina is knocked unconsious and Dastan has to fight a Hassassin with whips. The Hassassin's leader manages to snatch the Dagger of Time from Tamina by using a trained snake. Eventually the whip Hassassin is killed by Garsiv who then succumbs to his injuries.
Tamina and Dastan, as well as Sheik Amar and Seso return to Alamut to reveal the truth about Nizam and the dagger to Tus. First they must get the dagger, which is kept in the sacred temple, guarded by the Hassansin who killed Garsiv. Seso, the master of throwing knives, fights the Hassassin who also throws knives to get the Dagger, he manages to kill the Hassassin but he's fatally wounded in the process and manages to throw the dagger out of the window to Dastan before dying. Sheik Amar then distracts the guards by serving as a decoy while Dastan then shows the truth about the Dagger to his brother Tus by killing himself only to have Tus rewind time with the dagger, afterwards Tus is killed by Nizam and Dastan is incapacitated by another Hassassin. The dagger is once again is Nizam's hands but Dastan with Tamina's help manages to defeat the Hassassin, Tamina realises that the Hassassin had been a spy inside the city of Alamut and must have been the one who told Nizam about the Dagger.
Nizam goes to the Sandglass chamber beneath the earth, as Dastan and Tamina race against the time to stop him. Tamina opens a secret gate leading to the chamber, however shortly after they encounter the leader of the Hassassins, after a close fight Dastan gets the upperhand an stabs the Hassassin before throwing him into the chasm. They then manage to reach Nizam as he pierces the Sandglass with the dagger. During the final confrontation, Tamina slips into the bottomless pit as she asserts that it's Dastan's destiny to carry on and stop Nizam. Dastan fights Nizam as they both hold their hands on the Dagger. Dastan then uses the Dagger's button to open the Sands of Time container and use its power against Nizam. The Sandglass slowly cracks and the sandstorm is shown destroying Alamut. Dastan is then able to use the Dagger and turn back the time, just as the Sandglass breaks. The timeline returns to the point when Dastan holds the Dagger for the first time, during the siege of Alamut.
In the final scenes of the movie, Dastan, accompanied by his best friend Bis, uses his knowledge to reveal Nizam's evil plan to his brothers. They don't believe it at first, but Nizam then attacks Dastan and as he is close to killing him, Tus saves him by killing Nizam. The Prince then meets Tamina and returns the Dagger of Time to her, as she looks at him surprised. Tus then suggests that perhaps Tamina should become Dastan's wife. The two of them are next shown talking to each other and Tamina expressing her surprise about Dastan's sudden change in behavior and hinting that he may have discovered something to which he replies that they are in control of their own destiny.
P/s：Honey还说看到她的弟弟在电影里，高兴到啊...笑到合不拢嘴哪！
