Role in the film
Tus is first seen alongside his brothers Dastan and Garsiv leading their father's forces to war against the Kosh. After a spy informs Nizam that the Holy City of Alamut has been providing the Kosh with weapons, Nizam convinces Tus, the leader of the army, to go into the city and crush it, despite King Sharaman's desire for it to be left in peace. Dastan protests, but Garsiv and Tus listen to their uncle Nizam instead. Dastan wants to lead the attack but Garsiv claims that he wants the first blood. Tus tells Dastan that he is not ready to lead the attack. The group begins firing catapults of flaming rocks toward the city. Dastan disregards Tus' orders and leads his own gang of warriors through the East gate of the city. Dastan opens the East Gate and takes on the “Impossible Gate” by climbing up a tower and entering from above. He notices Alamutian soldiers charging towards his men, so he knocks over a large bowl of boiling oil and ignites it to create a barrier of flames.
Tus and Garsiv are impressed by Dastan's daring, and they decide to confront the Princess and Tus declares his intention to marry her to keep the peace between Persia and the people of Alamut. Dastan and Bis are drunk with their men when Tus comes riding on horseback. Tus tells Dastan that their father is riding in and asks where Dastan's gift is. Dastan has misplaced his in his drunken stupor, so Tus gives Dastan the robes of the high regent of Alamut to present to their father. Tus tells Dastan that if their father doesn't agree to have Tamina marry Tus, Dastan must kill her. He notices Dastan's dagger and asks Dastan for it, but Nizam arrives and reminds Tus that Dastan delivered him that entire city. Tus goes and meets with Nizam and King Sharaman but King Sharaman is outraged that Tus attacked the holy city. King Sharaman tells Tus that he is not ready to be king, despite how much he'd like to be.
In the banquet, Dastan presents his father with the robes of the regent. His father tells him that he is proud of him but that Dastan hasn't learned that a real leader does what he has to in order to defend what he knows is right. Dastan asks his father to allow Tus to marry Tamina, but King Sharaman points out that Tus has many wives. Since Dastan has none, King Sharaman gives Tamina to Dastan as his first wife. Dastan is shocked and can barely speak before his father starts screaming. The robes of the high regent were covered in poisonous acid which eat away at the king. Garsiv tries to rip them off while Dastan screams for help but Dastan appears to be a murderer. His father's guards move to capture him, but Bis jumps to his aid and fights them. Bis is quickly killed but Tamina leads Dastan out of the palace. They escape the city on horseback with Garsiv in pursuit.
Nizam talks to Tus and Garsiv about what should be done with Dastan. Tus wants to put him on trial, but Nizam tells him that Dastan should be killed and not allowed to return; otherwise his accusations could destabilize the region. Garsiv is suspicious of Nizam's desire to have Dastan killed but says nothing. Tus tells him that Dastan will be put on trail and ends the discussion.
Tus is taken hostage by Dastan, who tells him that it Nizam's plot to kill their father, not his. He then explains the dagger's powers but can tell that Tus doesn't believe him. With Tamina watching, he stabs himself through the heart with the dagger as Tus cries out in shock. Nizam enters and tells Tus that Dastan took the coward's way out. However, Tus picks up the dagger and goes back in time and prevents Dastan's death. Dastan is relieved that Tus used the dagger (having gambled it all on the fact that he would), but Nizam enters and immediately slits Tus's throat.
Tus later appears after Dastan alters the timeline, stabbing Nizam in the stomach as he tries to kill Dastan. He later apologizes for the attack and offers Tamina a marriage to Dastan to heal the broken trust between Persia and Alamut.