In the Victorian London, the barber Benjamin Barker is married to the gorgeous Lucy and they have a lovely child, Johanna. The beauty of Lucy attracts the attention of the corrupt Judge Turpin, who falsely accuses the barber of a crime that he did not commit and abuses Lucy later after gaining custody of her. After fifteen years in exile, Benjamin returns to London under the new identity of Sweeney Todd, seeking revenge against Turpin. He meets the widow Mrs. Lovett who is the owner of a meat pie shop who tells him that Lucy committed suicide with arsenic many years ago, and Turpin assigned himself tutor of Johanna. He opens a barber shop above her store, initiating a crime rampage against those who made him suffer and lose his beloved family.
Benjamin Barker, arguably the most accomplished barber in all Victorian London, is married to the pretty Lucy, the two who have an infant daughter, Johanna. Lusting after Lucy, a sadistic judge named Turpin wrongfully has Barker sent to prison in Australia so that he can have Lucy to himself. Fifteen years later, Barker, who has rechristened himself Sweeney Todd, returns to London to seek revenge by killing Turpin and his accomplice Beadle Bamford, using the instruments of his trade to slit their throats. Below Todd's old barber shop is now a meat pie shop run by Mrs. Lovett, who admits to making the worst meat pies in London. She tells Todd that Lucy poisoned herself after being raped by Turpin, and that Johanna, now a young woman, is Turpin's ward. Johanna and a young honorable sailor named Anthony Hope, who Todd met sailing into London, have fallen in love with each other from afar. Much like his feelings for Lucy, Turpin lusts after Johanna and wants to marry her, and thus he will do whatever he needs to to get Anthony out of the way. Back at the barber shop, Todd changes his plans for revenge solely on Turpin and Beadle out of circumstance, which includes an encounter with a rival barber named Adolfo Pirelli and a close encounter with Turpin himself. Including Turpin and Beadle, Todd's revenge is now directed at all mankind that has wronged him. Todd is helped in his new endeavor by Mrs. Lovett, who has an interesting role in their collective scheme. Todd may reconsider his new collaboration with Mrs. Lovett if he were to learn her true motivations.
After hard years in exile for a crime he didn't commit, Benjamin Barker, now Sweeney Todd, returns to London to find his wife dead and his daughter in the hands of the evil Judge Turpin. In his anger, Sweeney goes on a murderous rampage on all London. With the help of Mrs. Lovett, he opens a barber shop in which he lures his victims with a charming smile before casually ending their lives with a flick of his razor across their necks. But not one man nor ten thousand men killed can satisfy Sweeney's lust for vengeance on those who've caused his years of pain.
Returning back to London after his wife and daughter were been stolen by Judge Turpin, Benjamin Barker adopts the name Sweeney Todd and relocates his barber business to the top of Mrs. Lovett's pie shop. Todd wants his revenge on the man who has now adopted his daughter and works with Mrs. Lovett on an evil plan. Todd will slice the throats of the unsuspecting public while giving them a shave. These bodies are then turned into Mrs. Lovett's new meat pies. With this plan being successful, all Todd needs to do now is try to convince the Judge to sit in his chair.